A173412 Number of three-choice polygons by area.

4, 12, 34, 96, 262, 706, 1866, 4876, 12590, 32220, 81780, 206182, 516682, 1288100, 3196414, 7899664, 19452002, 47741832, 116827972, 285121530, 694145540, 1686165640, 4087501476, 9889956114, 23887544730, 57602999360, 138696210062, 333483756402, 800784138674, 1920539773188, 4600776445384, 11009534409116, 26318680827474, 62855267076802, 149976974496002, 357547693790338, 851705230512838, 2027255882196068

Offset

1,1

References

A. J. Guttmann and I. Jensen, Fuchsian differential equations for the perimeter generating function of three-choice polygons, Sem. Lothar. Combin., 54 (2006), B54c (14pp).

Links

Table of n, a(n) for n=1..38.

A. J. Guttmann and I. Jensen, Fuchsian differential equations for the perimeter generating function of three-choice polygons, Sem. Lothar. Combin., 54 (2006), B54c (14pp).

Crossrefs

Sequence in context: A248873 A180224 A293005 * A079818 A115390 A005056

Adjacent sequences: A173409 A173410 A173411 * A173413 A173414 A173415

Keyword

nonn

Author

Iwan Jensen (I.Jensen(AT)ms.unimelb.edu.au), Feb 17 2010, corrected Feb 21 2010

Status

approved