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A057410
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Number of staircase polygons of perimeter 2n with one (staircase polygon) hole on square lattice (not allowing rotations).
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4
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1, 12, 94, 604, 3463, 18440, 93274, 454412, 2151673, 9964500, 45335002, 203303760, 900901387, 3952468348, 17194102478, 74257185512, 318693463933, 1360298775524, 5778468266446, 24442845038580
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OFFSET
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8,2
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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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