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%I #4 Mar 30 2012 16:50:30
%S 0,1,2,9,36,170,832,4318,23164,128141,725806,4194923,24657628,
%T 147053105,888044678,5421873743,33423442196,207811667858,
%U 1301996110320,8213617403274,52138266933540,332834181990220
%N Number of osculating polygons of perimeter 2n on square lattice.
%H I. Jensen, <a href="/A121345/b121345.txt">Table of n, a(n) for n = 1..44</a> (from link below)
%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/square.perim.osculating.ser">More terms</a>
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Aug 29 2006
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