A121771 Series expansion for first area weighted moment of neighbor-avoiding polygons on square lattice.

0, 1, 0, 4, 12, 71, 364, 1922, 10048, 52128, 269192, 1385620, 7119736, 36557434, 187709328, 964257232, 4956991384, 25505488079, 131365052196, 677293606418, 3495682276028, 18061051214195, 93412032650220

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: A358409 A180386 A302434 * A009621 A335907 A013195

Adjacent sequences: A121768 A121769 A121770 * A121772 A121773 A121774

Keyword

nonn

Author

N. J. A. Sloane, Aug 30 2006

Status

approved