A145791 - OEIS

A145791

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either four adjacent vertically or four adjacent horizontally.

%I #3 Mar 31 2012 12:35:08

%S 1,1,1,3,1,6,1,17,26,113,318,1310,4072,21570,65328,442636,1558383,

%T 13750703,69409037,646392443,4686057331,48049954607,457665821401,

%U 5254108049909,63960030819910,855193502729867

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either four adjacent vertically or four adjacent horizontally.

%K nonn

%O 1,4

%A _R. H. Hardin_, Oct 19 2008