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A173414
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Number of imperfect staircase polygons by area.
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0
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1, 4, 15, 47, 143, 412, 1157, 3170, 8534, 22631, 59295, 153768, 395297, 1008606, 2556663, 6443702, 16158018, 40334613, 100277824, 248396782, 613265776, 1509538293, 3705476893, 9072944868, 22163755695, 54026509101, 131433905615
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OFFSET
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3,2
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REFERENCES
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A. R. Conway, A. J. Guttmann and M. Delest, The number of three-choice polygons, Mathl. Comput. Modelling, 26 (1997), 51-58.
A. J. Guttmann and I. Jensen, Fuchsian differential equation for the perimeter generating function of three-choice polygons, Semi. Lothar. Combin., 54 (2006), B54c (14pp).
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LINKS
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Table of n, a(n) for n=3..29.
A. R. Conway, A. J. Guttmann and M. Delest, The number of three-choice polygons, Mathl. Comput. Modelling, 26 (8-10) (1997), 51-58.
A. J. Guttmann and I. Jensen, Fuchsian differential equation for the perimeter generating function of three-choice polygons, Semi. Lothar. Combin., 54 (2006), B54c (14pp).
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CROSSREFS
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Sequence in context: A111038 A188716 A100506 * A307075 A219903 A238807
Adjacent sequences: A173411 A173412 A173413 * A173415 A173416 A173417
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KEYWORD
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nonn
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AUTHOR
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Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010
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STATUS
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approved
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