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

Author

N. J. A. Sloane, Aug 30 2000

Keywords

• nonn

Links

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

Crossrefs

Cf. A002931, A056625.

Extensions

Title clarified by Sean A. Irvine, Apr 26 2022