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A146409
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 73, 235, 975, 4059, 17677, 73575, 388495, 2342809, 17238179, 130497747, 1139591877, 10255691217, 112977046301
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.0.0
.0.0.1.1.1.1.0.0
.0.1.0.0.1.0.1.1
.0.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.0
.1.1.0.1.0.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A146734 A146614 A146670 * A147111 A146401 A146465
KEYWORD
nonn
AUTHOR
STATUS
approved