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Search: id:A073913
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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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+0
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
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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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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Iwan Jensen, Table of n, a(n) for n = 0..117 [Data from web page]]
Iwan Jensen, Polygon enumerations.
Iwan Jensen, Andrew Rechnitzer, The exact perimeter generating function for a model of punctured staircase polygons, J. Phys. A: Math. Theor. 41 (2008) 215002, Table 1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 02 2009]
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CROSSREFS
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Cf. A057410, A057414.
Sequence in context: A055022 A044263 A044644 this_sequence A057410 A045894 A045829
Adjacent sequences: A073910 A073911 A073912 this_sequence A073914 A073915 A073916
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KEYWORD
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nonn
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AUTHOR
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Olivier Gerard, Feb 14 2009, based on data from the web site of Iwan Jensen.
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