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A146471 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,1,1,13,13,69,69,457,457,6223,6223,127787,127787,3658281,

%T 3658281,163817453,163817453,11238713859,11238713859,1160267254915,

%U 1160267254915

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.1.1.1.0.1.1.1.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.1.1.1.0.1.1.1.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_

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Last modified April 23 07:42 EDT 2024. Contains 371905 sequences. (Running on oeis4.)