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A173413
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Number of imperfect staircase polygons counted by half-perimeter.
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0
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1, 6, 29, 130, 561, 2368, 9855, 40622, 166303, 677420, 2748952, 11122504, 44898891, 180912196, 727866627, 2924860426, 11741400147, 47094376488, 188760540056, 756125505044, 3027303565311, 12115171905092, 48466474069668
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OFFSET
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4,2
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COMMENTS
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Generating function is the solution of a Fuchsian ODE of order 8.
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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, Sem. Lothar. Combin., 54 (2006), B54c (14pp).
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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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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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