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%I #7 Apr 07 2015 11:02:23
%S 1,6,37,195,975,4622,21128,94109,410820,1766591,7506179,31596240,
%T 131991619,547992183,2263477612,9309386178,38150082057,155859235424,
%U 635067478628,2581737704039
%N Number of n-celled polyominoes with 1 hole.
%H Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/animals.html">Enumeration of polyominoes</a>
%K nonn
%O 7,2
%A _N. J. A. Sloane_, Sep 05 2000
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