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%I #11 Jul 19 2014 09:30:27
%S 1,2,4,9,20,46,105,243,561,1303,3026,7047,16419,38314,89454,209056,
%T 488810,1143686,2677074,6269438,14687799,34423317,80702234,189258382,
%U 443958607,1041704375,2444830929,5739200960,13475465449
%N Number of staircase polygons of area n with any number of (staircase polygon) holes on square lattice (not allowing rotations).
%H I. Jensen, <a href="/A057417/b057417.txt">Table of n, a(n) for n = 1..76</a> (from link below)
%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/staircase.area.allholes.ser">More terms</a>
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Aug 30 2000
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