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A146589
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0110-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 9, 25, 67, 353, 1577, 17635, 202483, 2019113, 31077783, 570196985, 14569116993, 519350763601, 19917427060103, 942336566340751, 58234146292140447, 4596656821240313323, 484270777652058510713
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.0.1.1.1.0.0
.0.0.0.1.1.0.1.0
.0.1.1.0.1.0.1.1
.1.1.1.1.0.1.1.1
.0.1.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
CROSSREFS
Sequence in context: A209530 A147392 A147318 * A146866 A271731 A126363
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved