%I
%S 1,12,88,524,2786,13788,64998,296032,1314648,5728172,24595512,
%T 104399172,439084884,1833027048,7605691356,31398503248,129072844079,
%U 528688519536,2158900271080,8792641674684,35728408159781
%N Number of selfavoiding polygons of area n with one (selfavoiding polygon) hole on square lattice (not allowing rotations).
%H I. Jensen, <a href="/A057406/b057406.txt">Table of n, a(n) for n = 8..41</a> (from link below)
%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/square.area.1hole.ser">More terms</a>
%K nonn
%O 8,2
%A _N. J. A. Sloane_, Aug 30 2000
