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A146400
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 7, 21, 51, 261, 1539, 11759, 111585, 1296125, 18399415, 335874781, 7824897067, 229077144211, 8419643660275, 387472393043501, 22360944601180667
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.0.1.0.0.0
.0.0.0.1.1.0.1.1
.0.0.1.0.1.0.1.0
.1.1.1.1.0.1.1.0
.1.0.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A070313 A146733 A146709 * A146408 A050894 A146464
KEYWORD
nonn
AUTHOR
STATUS
approved