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A147430 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0101 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,1,1,9,9,25,25,89,89,469,469,5217,5217,82459,82459,

%T 1354121,1354121,28702995,28702995,915889909,915889909

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0101 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .1.0.1.0.0.0.1.0.1

%e .1.1.1.1.0.1.1.1.1

%e .0.1.0.1.0.1.0.1.0

%e .0.0.0.0.0.0.0.0.0

%e .0.1.0.1.0.1.0.1.0

%e .1.1.1.1.0.1.1.1.1

%e .1.0.1.0.0.0.1.0.1

%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 May 6 10:47 EDT 2024. Contains 372293 sequences. (Running on oeis4.)