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A147213
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0011 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 39, 117, 361, 955, 3303, 16663, 85069, 434621, 2513479, 17082851, 120871405, 925679621
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.0.0.0.1.1.1.0.1
.0.0.0.1.1.0.1.1
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.1.1.0.1.1.0.0.0
.1.0.1.1.1.0.0.0
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A038163 A327381 A146819 * A146441 A147341 A208972
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved