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A147023
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11111-01000 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 29, 49, 194, 513, 1943, 5111, 18756, 56573, 304185, 1238797, 7708601, 34648607, 235404133, 1230092163, 10469480011, 68020491883
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.1.0.0
.0.1.0.0.0.1.0.1.0
.0.1.0.0.0.0.1.1.1
.0.1.0.0.0.0.0.1.0
.1.1.1.0.0.0.0.1.0
.0.1.0.1.0.0.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.1.0.0.0.0.0
CROSSREFS
Sequence in context: A073022 A129694 A147015 * A108402 A090795 A087732
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved