A146257 - OEIS

A146257

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-101 pattern in any orientation.

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,105,241,1729,3313,39657,104401,2969697,9697625,

%T 3123603217,14435373673,2122314213377,11094314340193,1937878683810145,

%U 12836441729414657,6546745088072698929,53161394239931798437

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-111-101 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.1.1

%e .1.0.1.0.0.1.0.1

%e .0.0.0.0.0.0.0.0

%e .1.0.1.0.0.1.0.1

%e .1.1.1.0.0.1.1.1

%e .0.1.1.0.0.1.1.0

%K nonn

%O 1,7

%A _R. H. Hardin_