A057407 Number of self-avoiding polygons of area n with 2 (self-avoiding polygon) holes on square lattice (not allowing rotations).

2, 36, 366, 2832, 18666, 110724, 609922, 3182038, 15931446, 77253554, 365240626, 1691895678, 7707586246, 34630458076, 153803559514, 676416563354, 2949990640350, 12772844235264, 54957447470264

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