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A146621 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1111 pattern in any orientation. 0

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

%S 1,1,1,1,1,5,13,33,131,465,2505,18109,137539,1253575,13645721,

%T 177302103,2859333451,55979477433,1308550606345,36559028261121,

%U 1227152834528187,49674730440765147,2427381380225360097

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.1.1.0.0

%e .0.0.1.0.0.1.0.0

%e .1.1.0.0.1.0.0.1

%e .1.0.0.0.1.1.1.1

%e .1.0.1.1.0.0.0.0

%e .1.1.0.1.0.0.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.1.1.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008

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Last modified April 23 10:21 EDT 2024. Contains 371905 sequences. (Running on oeis4.)