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A173411 Number of three-choice polygons by half-perimeter 0
4, 12, 42, 152, 562, 2108, 7986, 30476, 116950, 450756, 1743470, 6763152, 26299104, 102478208, 400032822, 1563985172, 6122945694, 23999991452, 94173327894, 369881810616, 1454036828992, 5720448937528, 22521468585822, 88725551176384 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Generating function is the solution of a Fuchsian ODE of order 8.

REFERENCES

A. R. Conway, A. J. Guttmann and M. Delest, Math. Comput. Modelling, 26 (1997), 51-58.

A. J. Guttmann and I. Jensen. Sem. Lothar. Combin., 54 (2006), B54c (14pp).

LINKS

Table of n, a(n) for n=2..25.

CROSSREFS

Sequence in context: A149345 A149346 A149347 * A149348 A149349 A149350

Adjacent sequences:  A173408 A173409 A173410 * A173412 A173413 A173414

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified December 22 22:37 EST 2014. Contains 252372 sequences.