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A146630 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0010 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,1,1,3,9,19,33,61,181,701,2981,12267,47389,212787,1164819,

%T 7692083,54594417,416739483,3346928919

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.0.1.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.1.0.0.1.1

%e .1.1.1.0.0.0.1.0

%e .0.1.0.0.0.1.1.1

%e .1.1.0.0.1.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.1.0.1.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008

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Last modified April 25 07:07 EDT 2024. Contains 371964 sequences. (Running on oeis4.)