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A147119
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 79, 209, 671, 2175, 8279, 34581, 151497, 746481, 3938933, 23401293
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.0.1.1.1.0.0
.0.0.0.1.1.0.0.0.0
.0.0.0.0.1.0.0.0.1
.0.1.0.0.1.0.0.0.1
.1.1.1.1.0.1.1.1.1
.1.0.0.0.1.0.0.1.0
.1.0.0.0.1.0.0.0.0
.0.0.0.0.1.1.0.0.0
.0.0.1.1.1.0.0.0.0
CROSSREFS
Sequence in context: A147111 A146401 A146465 * A146184 A155274 A058058
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved