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A147135
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1001-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 59, 157, 473, 1581, 5917, 23197, 94123, 435079, 2125669
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.1.0.0
.0.0.0.1.0.0.0.1.1
.1.1.1.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.1.1.1
.1.1.0.0.0.1.0.0.0
.0.0.1.0.0.1.0.0.0
.0.0.1.1.1.1.0.0.0
CROSSREFS
Sequence in context: A049749 A147055 A146638 * A146843 A146630 A146710
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved