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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

%I

%S 2,36,366,2832,18666,110724,609922,3182038,15931446,77253554,

%T 365240626,1691895678,7707586246,34630458076,153803559514,

%U 676416563354,2949990640350,12772844235264,54957447470264

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

%H I. Jensen, <a href="/A057407/b057407.txt">Table of n, a(n) for n = 13..44</a> (from link below)

%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/square.area.2hole.ser">More terms</a>

%K nonn

%O 13,1

%A _N. J. A. Sloane_, Aug 30 2000

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Last modified September 27 06:14 EDT 2022. Contains 357052 sequences. (Running on oeis4.)