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A146419
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 5, 9, 24, 33, 92, 207, 751, 1987, 9135, 27247, 151575, 553091, 3687021, 16183258, 127736835, 672115551, 6393532548, 40630854716, 467493592708
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.1.1.1.0.0.0.0
.0.0.1.0.0.0.0.1
.0.0.1.0.1.1.1.1
.0.0.1.0.0.0.0.1
.1.0.0.0.0.1.0.0
.1.1.1.1.0.1.0.0
.1.0.0.0.0.1.0.0
.0.0.0.0.1.1.1.0
CROSSREFS
Sequence in context: A271543 A272256 A132354 * A365070 A162907 A165345
KEYWORD
nonn
AUTHOR
STATUS
approved