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A014610
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Tetranacci numbers arising in connection with current algebras sp(2)_n.
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1
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3, 5, 10, 19, 37, 71, 137, 264, 509, 981, 1891, 3645, 7026, 13543, 26105, 50319, 96993, 186960, 360377, 694649, 1338979, 2580965, 4974970, 9589563, 18484477, 35629975, 68678985, 132383000, 255176437, 491868397, 948106819, 1827534653, 3522686306, 6790196175
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..33.
Noureddine Chair, Grassmannian Cohomology Rings and Fusion Rings From Algebraic Equations, arXiv:hep-th/9704138, 1997.
Index entries for linear recurrences with constant coefficients, signature (1,1,1,1).
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FORMULA
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G.f.: (3+2x+2x^2+x^3)/(1-x-x^2-x^3-x^4).
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MATHEMATICA
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LinearRecurrence[{1, 1, 1, 1}, {3, 5, 10, 19}, 29] (* Jean-François Alcover, Feb 24 2019 *)
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PROG
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(PARI) my(p=Mod('x, 'x^4-'x^3-'x^2-'x-1)); a(n) = -subst(lift(p^(n+7)), 'x, -1); \\ Kevin Ryde, May 03 2021
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CROSSREFS
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Sequence in context: A158943 A133999 A238431 * A117591 A003055 A317766
Adjacent sequences: A014607 A014608 A014609 * A014611 A014612 A014613
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KEYWORD
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easy,nonn
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AUTHOR
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Noureddine Chair
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STATUS
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approved
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