A144052 - OEIS

A144052

Number of n X n binary arrays with every 1 adjacent to at least one other 1, but at most one 1 adjacent horizontally and at most one 1 adjacent vertically.

%I #3 Mar 31 2012 12:35:07

%S 1,10,67,1859,144973,23675451,10663538347,12275556405619,

%T 35393545223418744,261328488528715635157,4921805399637541783782081,

%U 235643299844227266763714703387

%N Number of n X n binary arrays with every 1 adjacent to at least one other 1, but at most one 1 adjacent horizontally and at most one 1 adjacent vertically.

%K nonn

%O 1,2

%A _R. H. Hardin_, Sep 08 2008