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A146741
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-1111 pattern in any orientation.
0
1, 1, 1, 1, 3, 13, 35, 153, 683, 3961, 40313, 425869, 5201531, 83958899, 1605656621, 40845335121, 1341029021439, 52952035760711, 2606494713905651, 160683571908609159
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.0.1.1.0.0.0
.0.0.0.1.1.0.0.0
.1.1.1.0.1.0.1.1
.1.1.1.1.0.0.1.1
.0.0.0.0.0.0.1.1
.0.0.0.1.1.1.0.1
.0.0.0.1.1.1.1.0
CROSSREFS
Sequence in context: A058214 A108480 A322187 * A146725 A146424 A146049
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved