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A146819
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 39, 117, 351, 957, 3341, 15997, 83175, 424759, 2415699, 15982837, 113541201, 873618675
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.1.1.1.0.0.0.0
.1.0.1.1.1.0.0.0
.1.1.0.0.1.0.0.0
.1.1.0.0.0.1.1.0
.0.1.1.0.0.0.1.1
.0.0.0.1.0.0.1.1
.0.0.0.1.1.1.0.1
.0.0.0.0.1.1.1.0
CROSSREFS
Sequence in context: A135117 A038163 A327381 * A147213 A146441 A147341
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved