A147229 - OEIS

A147229

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation.

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,1,4,9,18,29,62,159,552,1625,6033,18370,76478,293679,

%T 1560810,7445670,46344151,251751509,1816985360,11749000262

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.0.0

%e .0.1.1.1.0.1.1.0

%e .1.1.0.1.1.0.1.0

%e .0.0.1.0.0.1.1.0

%e .0.1.1.0.0.1.0.0

%e .0.1.0.1.1.0.1.1

%e .0.1.1.0.1.1.1.0

%e .0.0.1.0.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008