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A057415
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Number of staircase polygons of area n with 2 (staircase polygon) holes on square lattice (not allowing rotations).
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1
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2, 10, 53, 220, 845, 2975, 9936, 31640, 97283, 290173, 844729, 2408213, 6746197, 18613290, 50688554, 136464665, 363724034, 960862781, 2518380075, 6554072749, 16949040877, 43580221577, 111475092069, 283799832989
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OFFSET
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13,1
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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