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A057412
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Number of staircase polygons of perimeter 2n with 3 (staircase polygon) holes on square lattice (not allowing rotations).
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1
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28, 884, 15266, 191688, 1964414, 17460336, 139630696, 1029053248, 7106319403, 46539551768, 291656481886, 1761110727936, 10301848134999, 58631700564776, 325806962400428, 1772760905500304, 9467673927142781
(list; graph; refs; listen; history; internal format)
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