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A146018 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation. 0

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

%S 1,1,1,1,3,13,41,219,1033,8217,92671,1241193,21102313,438374597,

%T 11919134635,429471270295,20089457592037,1200700834920789,

%U 91306423605321353,8917989878582336861

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.0.0.0

%e .0.0.0.0.1.0.0.1

%e .0.0.0.0.1.0.0.1

%e .0.0.0.0.1.1.0.1

%e .1.1.1.1.0.0.1.1

%e .0.0.0.1.0.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.1.1.1.1.0.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 26 2008

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Last modified April 24 10:53 EDT 2024. Contains 371936 sequences. (Running on oeis4.)