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A145947 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation. 0

%I #3 Mar 31 2012 12:35:08

%S 1,1,1,1,1,3,9,19,41,145,647,3181,16339,99371,747763,6609081,67311501,

%T 786968963,10964146353,178363016765,3416486494947,75509091003073,

%U 1969327519976023,59733023396132639,2140235098426680865

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.1.1.0.0.0

%e .0.0.1.0.0.1.1.1

%e .1.1.1.0.0.1.0.0

%e .0.0.0.1.1.0.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.0.1.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Oct 25 2008

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Last modified May 5 21:04 EDT 2024. Contains 372287 sequences. (Running on oeis4.)