A057406 Number of self-avoiding polygons of area n with one (self-avoiding polygon) hole on square lattice (not allowing rotations).

1, 12, 88, 524, 2786, 13788, 64998, 296032, 1314648, 5728172, 24595512, 104399172, 439084884, 1833027048, 7605691356, 31398503248, 129072844079, 528688519536, 2158900271080, 8792641674684, 35728408159781

Offset: 8

Author

N. J. A. Sloane, Aug 30 2000

Keywords

• nonn

Links

• I. Jensen, Table of n, a(n) for n = 8..41 (from link below)
• I. Jensen, More terms