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A146254 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,3,11,15,27,47,153,311,1151,2849,13187,36901,183137,

%T 600651,3599693,14056563,100844845,464890609,3938830471,21240835037,

%U 209440142193,1329357548469,15466899531131,115875805461919

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.1.0

%e .1.1.0.0.1.1.1.0

%e .1.1.1.0.1.1.0.0

%e .0.1.1.0.0.0.0.0

%e .0.0.0.0.0.1.1.0

%e .0.0.1.1.0.1.1.1

%e .0.1.1.1.0.0.1.1

%e .0.1.1.0.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_

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Last modified July 18 03:34 EDT 2024. Contains 374377 sequences. (Running on oeis4.)