A146217 - OEIS

A146217

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 101-111-010 pattern in any orientation.

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

%S 1,1,3,1,7,1,112,79,2558,1063,209802,27065,20175581,2447221,

%T 6126604790,890042930,4313282889342,407961935451,7026857211622192,

%U 392627753805036,22754595511201832755,1023436778780854869,178462597153459704022556

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 101-111-010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.1.1.1

%e .1.0.1.0.0.1.0.1

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.1.1.1

%e .1.0.1.0.0.1.0.1

%K nonn

%O 1,3

%A _R. H. Hardin_