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A146702
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 65, 197, 769, 3257, 13441, 53529, 253559, 1417627, 9502081, 68675873, 543081895, 4543747499
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.0.0.1.1
.0.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.0
.1.1.0.0.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.1.1.0.0.0.0
CROSSREFS
Sequence in context: A146630 A146710 A146803 * A146734 A146614 A146670
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved