A147094 - OEIS

A147094

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,3,7,15,31,73,307,1451,6775,33773,192865,1471507,13382667,

%T 137085697,1565839497,20450552451,319414253795,5882181538191,

%U 126047394686961,3114606848932875

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.0.0.0.0

%e .0.0.0.1.0.1.0.0

%e .1.1.1.1.0.1.0.0

%e .0.0.0.0.0.1.0.1

%e .0.0.1.1.1.1.0.1

%e .0.0.0.0.0.0.0.1

%e .0.0.0.0.1.1.1.1

%K nonn

%O 1,4

%A _R. H. Hardin_, Nov 04 2008