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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

Adjacent sequences:  A057404 A057405 A057406 * A057408 A057409 A057410

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 30 2000

STATUS

approved

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Last modified October 15 23:54 EDT 2019. Contains 328038 sequences. (Running on oeis4.)