A146584 - OEIS

A146584

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111 pattern in any orientation.

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

%S 1,1,1,1,1,1,9,15,53,69,367,797,5383,14177,132187,419443,4770865,

%T 18981007,272701021,1381813173,25671154071,163453499965

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.0.0.1.1.1

%e .1.0.0.0.1.1.0.0

%e .1.1.1.0.0.1.0.0

%e .0.1.0.0.0.0.0.0

%e .0.0.0.0.0.0.1.0

%e .0.0.1.0.0.1.1.1

%e .0.0.1.1.0.0.0.1

%e .1.1.1.0.0.0.0.1

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008