A146137 - OEIS

A146137

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation.

%I #3 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,149,307,3283,9637,237685,792401,149008323,690862749,

%T 219427051049,1350088886833,717485827831517,5812692511149509,

%U 9087725403509413361,98388300257852844757,382960435361198474272451

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.1.1.1

%e .0.0.1.0.0.1.0.0

%e .0.0.0.0.0.0.0.0

%e .1.0.0.0.0.0.0.1

%e .1.1.1.0.0.1.1.1

%e .0.1.0.0.0.0.1.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 27 2008