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A146843 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all 1's connected only in a 1001-1111-1000 pattern in any orientation. 0

%I #8 Jan 16 2022 11:07:17

%S 1,1,1,1,1,1,1,1,3,9,19,33,61,167,557,1931,7517,29489,124159,584129,

%T 3130749,18534977

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all 1's connected only in a 1001-1111-1000 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.1.0.0.1.0.0

%e .0.0.0.1.1.1.1.0.0

%e .0.0.0.1.0.0.0.1.1

%e .1.1.1.0.0.0.0.1.0

%e .0.1.0.0.0.0.0.1.0

%e .0.1.0.0.0.0.1.1.1

%e .1.1.0.0.0.1.0.0.0

%e .0.0.1.1.1.1.0.0.0

%e .0.0.1.0.0.1.0.0.0

%K nonn,more

%O 1,9

%A _R. H. Hardin_, Nov 04 2008

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Last modified April 19 02:45 EDT 2024. Contains 371782 sequences. (Running on oeis4.)