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A146924
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 13, 32, 116, 329, 1343, 7578, 43263, 292424, 2337772, 20731810, 226646472, 2872512529, 41869404152, 707811350778, 14078518669729, 324770949354296
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.1.0.1.0
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.0.1.0.1.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
CROSSREFS
Sequence in context: A272539 A066184 A231799 * A342032 A272161 A272828
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved