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A056631
a(n) is the total second area moment of all self-avoiding polygons of length 2n on the square lattice.
2
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
Sequence in context: A209074 A124152 A293069 * A190560 A266361 A298281
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 30 2000
EXTENSIONS
Title clarified by Sean A. Irvine, Apr 26 2022
STATUS
approved