A121772 Series expansion for first area weighted moment of neighbor-avoiding polygons on square lattice.

0, 1, 0, 6, 30, 246, 1670, 11132, 71292, 442642, 2685392, 15995460, 93918296, 545202570, 3136082636, 17904903342, 101594620516, 573479526968, 3222969297490, 18045116141404, 100704940182826, 560417613651508

Offset

1,4

Links

I. Jensen, Table of n, a(n) for n = 1..41 (from link below)

I. Jensen, More terms

Crossrefs

Sequence in context: A228873 A366809 A133668 * A270845 A277073 A052585

Adjacent sequences: A121769 A121770 A121771 * A121773 A121774 A121775

Keyword

nonn

Author

N. J. A. Sloane, Aug 30 2006

Status

approved