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A146605
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 9, 19, 59, 237, 1193, 6925, 46535, 385115, 3834729, 46129325, 665267927, 11525172145, 240724568637, 6036636466243, 182136263500283, 6609883325424453
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.0.0.1.0.0.0
.0.0.0.0.1.0.0.0
.1.0.0.0.1.1.0.0
.1.1.1.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A146429 A297390 A018316 * A147070 A130586 A147146
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved