# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a147320 Showing 1-1 of 1 %I A147320 #4 Mar 31 2012 12:35:16 %S A147320 1,1,1,1,1,1,1,1,6,1,33,9,187,25,1110 %N A147320 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation. %e A147320 Maximal 9 X 9 example %e A147320 .0.0.1.1.1.1.1.0.0 %e A147320 .0.0.0.0.1.0.0.0.0 %e A147320 .1.0.0.0.1.0.0.0.1 %e A147320 .1.0.0.0.1.0.0.0.1 %e A147320 .1.1.1.1.0.1.1.1.1 %e A147320 .1.0.0.0.1.0.0.0.1 %e A147320 .1.0.0.0.1.0.0.0.1 %e A147320 .0.0.0.0.1.0.0.0.0 %e A147320 .0.0.1.1.1.1.1.0.0 %K A147320 nonn %O A147320 1,9 %A A147320 _R. H. Hardin_ # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE