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A146689
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1000-1111 pattern in any orientation.
0
1, 1, 1, 1, 5, 13, 49, 193, 1049, 4657, 30659, 227143, 2543595, 27086837, 477421833, 7701671605
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.1.1.1.0.0.0.0
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.0.0.0.0.1.1.1.1
.1.1.1.1.0.0.0.0
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.0.0.0.0.1.1.1.1
CROSSREFS
Sequence in context: A149535 A149536 A149537 * A146657 A243304 A238508
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved