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A057407 Number of self-avoiding polygons of area n with 2 (self-avoiding polygon) holes on square lattice (not allowing rotations). 1
2, 36, 366, 2832, 18666, 110724, 609922, 3182038, 15931446, 77253554, 365240626, 1691895678, 7707586246, 34630458076, 153803559514, 676416563354, 2949990640350, 12772844235264, 54957447470264 (list; graph; refs; listen; history; text; internal format)
OFFSET
13,1
LINKS
I. Jensen, Table of n, a(n) for n = 13..44 (from link below)
I. Jensen, More terms
CROSSREFS
Sequence in context: A229679 A119582 A157055 * A286266 A193127 A092852
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 30 2000
STATUS
approved

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Last modified June 20 20:53 EDT 2024. Contains 373532 sequences. (Running on oeis4.)