A146264 - OEIS

A146264

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

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

%S 1,1,5,17,45,281,4672,78267,1571678,52679419,3071977536,240721783237,

%T 27403978688452,4744390760050525,1239071516389632223

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

%e Maximal 8 X 8 example

%e .0.1.1.1.0.1.1.1

%e .0.0.1.0.0.0.1.0

%e .1.1.0.0.0.0.0.0

%e .1.1.1.0.0.0.1.1

%e .1.1.0.1.0.1.1.1

%e .0.0.1.1.1.0.1.1

%e .0.0.1.1.1.0.0.0

%K nonn

%O 1,3

%A _R. H. Hardin_