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A146609
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0001 pattern in any orientation.
0
1, 1, 1, 1, 5, 13, 31, 93, 435, 2055, 12617, 84101, 749259, 7832803, 101765203, 1516307327, 27862176903, 604272411455
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.0.0.1.1
.1.1.1.1.0.0.1.0
.1.0.0.0.0.0.1.0
.0.0.0.0.0.1.1.0
.0.1.1.0.0.0.0.0
.0.1.0.0.0.0.0.1
.0.1.0.0.1.1.1.1
.1.1.0.0.1.0.0.0
CROSSREFS
Sequence in context: A097969 A082280 A007708 * A121129 A051402 A147022
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved