A144053 - OEIS

A144053

Number of n X n binary arrays, symmetric under horizontal reflection, 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 1,4,5,25,357,4765,90553,3100249,146194232,11993787067,1839157793733,

%T 369768109497405,136403046959201932,67251730314890513141,

%U 66275214154448397358578,79949861700558334494500876

%N Number of n X n binary arrays, symmetric under horizontal reflection, 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