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A147447 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,3,7,13,39,123,461,2371,13249,80863,611487,5648891,61162833,

%T 795442861,12190308735,215424452659

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.0.1.1.0.0

%e .0.0.1.1.0.1.1.0

%e .0.0.0.1.1.0.1.1

%e .0.0.0.0.1.1.0.1

%e .0.0.0.0.0.1.1.0

%K nonn

%O 1,6

%A _R. H. Hardin_

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)