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A173414
Number of imperfect staircase polygons by area.
0
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
OFFSET
3,2
REFERENCES
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).
LINKS
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).
CROSSREFS
Sequence in context: A111038 A188716 A100506 * A307075 A219903 A238807
KEYWORD
nonn
AUTHOR
Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010
STATUS
approved