Search: id:A030228
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%I A030228
%S A030228 0,0,0,2,6,25,88,335,1215,4534,16823,63159,237679,900341,3423201,
%T A030228 13073163,50095285,192599091,742576616,2870584814,11122879867,
%U A030228 43191525139
%N A030228 Number of n-celled polyominoes without bilateral symmetry.
%C A030228 A000105(n) + a(n) = A000988(n) because the number of free polyominoes 
               plus the number of polyominoes lacking bilateral symmetry equals 
               the number of one-sided polyominoes. - Graeme McRae" (g_m(AT)mcraefamily.com), 
               Jan 05 2006
%Y A030228 Sequence in context: A086591 A073545 A103063 this_sequence A066317 A027104 
               A019048
%Y A030228 Adjacent sequences: A030225 A030226 A030227 this_sequence A030229 A030230 
               A030231
%K A030228 nonn
%O A030228 1,4
%A A030228 Dave Wilson

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