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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 (list; graph; refs; listen; history; text; internal format)
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

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).

CROSSREFS

Sequence in context: A111038 A188716 A100506 * A307075 A219903 A238807

Adjacent sequences:  A173411 A173412 A173413 * A173415 A173416 A173417

KEYWORD

nonn

AUTHOR

Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010

STATUS

approved

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Last modified April 8 08:54 EDT 2020. Contains 333313 sequences. (Running on oeis4.)