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%I #13 Apr 26 2022 20:55:08
%S 16,72,384,1864,8720,40064,180992,805416,3542720,15437280,66739168,
%T 286614344,1223894208,5200593136,22003683264,92745730384,389613088944,
%U 1631810452416,6816075114112,28401442383848
%N a(n) is the total squared perimeter of all self-avoiding polygons of area n on the square lattice.
%H I. Jensen, <a href="/A056633/b056633.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.peri_mom2.ser">More terms</a>
%Y Cf. A002931, A056632.
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Aug 30 2000
%E Title clarified by _Sean A. Irvine_, Apr 26 2022
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