%I A057418
%S A057418 1,6,37,195,975,4622,21128,94109,410820,1766591,7506179,31596240,
%T A057418 131991619,547992183,2263477612,9309386178,38150082057,155859235424,
%U A057418 635067478628,2581737704039
%N A057418 Number of n-celled polyominoes with 1 hole.
%H A057418 Tomas Oliveira e Silva, <a href="http://www.ieeta.pt/~tos/animals.html">
               Enumeration of polyominoes</a>
%Y A057418 Sequence in context: A056338 A056328 A156185 this_sequence A001419 A081152 
               A033116
%Y A057418 Adjacent sequences: A057415 A057416 A057417 this_sequence A057419 A057420 
               A057421
%K A057418 nonn
%O A057418 7,2
%A A057418 N. J. A. Sloane (njas(AT)research.att.com), Sep 05 2000