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A146869 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation. 0

%I

%S 1,1,1,1,1,1,9,29,49,117,309,1103,4069,20291,72247,389841,1904157,

%T 13920727,88083783,777496329,5560593885,59069816813

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.1.0

%e .1.0.1.1.0.1.0.0

%e .1.1.1.1.0.1.1.0

%e .0.0.0.0.0.1.1.0

%e .0.1.1.0.0.0.0.0

%e .0.1.1.0.1.1.1.1

%e .0.0.1.0.1.1.0.1

%e .0.1.1.0.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008

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Last modified May 28 04:36 EDT 2020. Contains 334671 sequences. (Running on oeis4.)