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A146175
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-100-111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 45, 121, 385, 1395, 5901, 28053, 137719, 714777, 4090907, 28017605, 214429525, 1879119265, 18054271787, 200571323617
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.0.1.0.1.0.0
.0.0.0.1.0.0.1.1
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.1.1.0.0.1.0.0.0
.0.0.1.0.1.0.0.0
.0.0.1.1.1.0.0.0
CROSSREFS
Sequence in context: A269713 A196069 A147182 * A146851 A146260 A147166
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved