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A073913
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Number of staircase polygons on the square lattice with perimeter 2n and one (possibly rotated) staircase polygonal hole.
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1
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1, 12, 94, 604, 3461, 18412, 93016, 452500, 2139230, 9890404, 44921002, 201099320, 889594210, 3896177956, 16920602244, 72954802376, 312595497011, 1332153819572, 5650155211024, 23864065957572, 100418115489408
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OFFSET
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0,2
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COMMENTS
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The old entry with this A-number was a duplicate of A070844.
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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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Olivier Gérard, Feb 14 2009, based on data from the web site of Iwan Jensen.
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STATUS
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approved
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