A056631 a(n) is the total second area moment of all self-avoiding polygons of length 2n on the square lattice.

1, 8, 70, 560, 4358, 33160, 248998, 1851040, 13655432, 100126648, 730548788, 5308524968, 38442000664, 277565593032, 1999068564026, 14365917755936, 103038218758426, 737765745264544, 5274413814993896, 37655943519835560

Offset

2,2

Links

I. Jensen, Table of n, a(n) for n = 2..43 (from link below)

I. Jensen, More terms

Crossrefs

Cf. A002931, A056625.

Sequence in context: A209074 A124152 A293069 * A190560 A266361 A298281

Adjacent sequences: A056628 A056629 A056630 * A056632 A056633 A056634

Keyword

nonn

Author

N. J. A. Sloane, Aug 30 2000

Extensions

Title clarified by Sean A. Irvine, Apr 26 2022

Status

approved