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A057413
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Number of staircase polygons of perimeter 2n with any number of (staircase polygon) holes on square lattice (not allowing rotations).
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1
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1, 2, 5, 14, 42, 132, 430, 1442, 4956, 17400, 62251, 226506, 836911, 3136182, 11906908, 45761338, 177903128, 699167112, 2776219871, 11132523840, 45062497156, 184057276510, 758328417263, 3150593560374, 13195743501195
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