# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a147324 Showing 1-1 of 1 %I A147324 #6 May 02 2021 21:01:49 %S A147324 1,1,1,1,1,1,5,15,54,179,629,2109,10035,48099 %N A147324 Number of n X n binary arrays symmetric under 180 degree rotation with all 1's connected only in a 00100-00100-00100-11111 pattern in any orientation. %e A147324 Maximal 8 X 8 example %e A147324 .1.1.1.1.1.0.0.1 %e A147324 .0.0.1.0.0.0.0.1 %e A147324 .0.0.1.0.1.1.1.1 %e A147324 .1.0.1.0.0.0.0.1 %e A147324 .1.0.0.0.0.1.0.1 %e A147324 .1.1.1.1.0.1.0.0 %e A147324 .1.0.0.0.0.1.0.0 %e A147324 .1.0.0.1.1.1.1.1 %K A147324 nonn %O A147324 1,7 %A A147324 _R. H. Hardin_ # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE