%I #4 Mar 30 2012 16:50:30
%S 0,1,4,26,148,908,5600,35358,225900,1460495,9528580,62659826,
%T 414794388,2761665143,18478780624,124186579380,837825377160,
%U 5671852529106,38515222492016,262266364986772,1790362225181496
%N Series expansion for first area weighted moment of osculating polygons on square lattice.
%H I. Jensen, <a href="/A121767/b121767.txt">Table of n, a(n) for n = 1..41</a> (from link below)
%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/square.area_mom1.osculating.ser">More terms</a>
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Aug 30 2006