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A146408
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 7, 21, 53, 267, 1477, 11799, 115813, 1314119, 18659927, 340219403, 7888629683, 233265020067, 8619893688875, 395425329029435, 22778671927694919, 1657248108130816043
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.0.1.1.0.0.0
.0.0.0.0.1.0.1.0
.0.1.0.0.1.0.1.0
.1.1.1.1.0.1.1.0
.1.0.0.0.1.0.1.1
.0.0.1.1.1.1.0.0
.0.0.0.0.0.1.0.0
CROSSREFS
Sequence in context: A146733 A146709 A146400 * A050894 A146464 A001354
KEYWORD
nonn
AUTHOR
STATUS
approved