A173411 Number of three-choice polygons by half-perimeter

4, 12, 42, 152, 562, 2108, 7986, 30476, 116950, 450756, 1743470, 6763152, 26299104, 102478208, 400032822, 1563985172, 6122945694, 23999991452, 94173327894, 369881810616, 1454036828992, 5720448937528, 22521468585822, 88725551176384

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