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A187567
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Number of Steiner Systems S(2,4,n).
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1
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 18, 0, 0
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OFFSET
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1,25
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COMMENTS
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S(2,4,n) exists if and only if n == 1 or 4 mod 12.
a(28) is >= 4653.
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REFERENCES
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Colin Reid and Alex Rosa, Steiner systems S(2,4,v) - a survey,
Electronic Journal of Combinatorics, Dynamic Survey DS18, Feb 01 2010.
E. Spence, The complete classification of Steiner Systems S(2,4,25), J. Combin. Designs, 4 (1996), 295-300.
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LINKS
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Table of n, a(n) for n=1..27.
Index entries for sequences related to Steiner systems
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CROSSREFS
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Cf. A187585, A001201, A030129.
Sequence in context: A257377 A246649 A210709 * A160145 A072839 A156400
Adjacent sequences: A187564 A187565 A187566 * A187568 A187569 A187570
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Mar 11 2011
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STATUS
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approved
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