# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a146142 Showing 1-1 of 1 %I A146142 #3 Mar 31 2012 12:35:09 %S A146142 1,1,1,1,1,3,23,43,81,319,1397,6447,41775,230237,1798489,13587111, %T A146142 143546329,1450499749,20575847369,276390467445,5233548027451, %U A146142 93375391444657 %N A146142 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation. %e A146142 Maximal 8 X 8 example %e A146142 .0.0.0.0.1.0.0.0 %e A146142 .0.0.0.0.1.1.0.0 %e A146142 .0.1.0.1.1.0.0.0 %e A146142 .1.1.1.0.0.1.0.0 %e A146142 .0.0.1.0.0.1.1.1 %e A146142 .0.0.0.1.1.0.1.0 %e A146142 .0.0.1.1.0.0.0.0 %e A146142 .0.0.0.1.0.0.0.0 %K A146142 nonn %O A146142 1,6 %A A146142 _R. H. Hardin_, Oct 27 2008 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE