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A147173
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 11, 27, 57, 269, 1741, 11383, 71261, 614161, 7140843, 99666239, 1560593149, 29491532325, 702793762267, 20557975075647
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.1.0
.0.0.0.0.1.1.1.0
.0.0.0.0.0.0.1.0
.0.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.0
.0.1.0.0.0.0.0.0
.1.1.1.1.0.0.0.0
.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A374337 A219621 A033960 * A147110 A372612 A147118
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved