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A147404
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
0
1, 1, 1, 5, 1, 9, 13, 53, 137, 741, 2493, 19441, 73321, 1016967, 4911015, 87040405, 643897713
OFFSET
1,4
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.1.1.0.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.0.1.1.0.0.1.1
.1.1.0.0.1.1.0.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.0.0.1.1.0.0.1.1
CROSSREFS
Sequence in context: A134233 A100542 A324378 * A254068 A146070 A308504
KEYWORD
nonn
AUTHOR
STATUS
approved