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A146401
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 77, 239, 919, 3879, 17353, 75579, 398897, 2332505, 16656293, 126029691, 1117371931, 10274166583
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
.0.1.0.1.0.0.1.1
.0.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.0
.1.1.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A146670 A146409 A147111 * A146465 A147119 A146184
KEYWORD
nonn
AUTHOR
STATUS
approved