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A057409 Number of self-avoiding polygons of area n with any number of (self-avoiding polygon) holes on square lattice (not allowing rotations). 1

%I

%S 1,2,6,19,63,216,756,2685,9650,35018,128084,471623,1746492,6499356,

%T 24290272,91123171,342984175,1294829776,4901319978,18597856445,

%U 70723784744,269486503694,1028736811230,3933715966653

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

%H I. Jensen, <a href="/A057409/b057409.txt">Table of n, a(n) for n = 1..40</a> (from link below)

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

%K nonn

%O 1,2

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

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Last modified September 20 07:59 EDT 2019. Contains 327214 sequences. (Running on oeis4.)