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A146271
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
0
1, 1, 1, 1, 5, 17, 56, 271, 962, 4903, 45104, 358857, 4309512, 55284185, 919547239, 17250892544, 432277811298, 11665546694793, 439099597024204
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.1
.0.0.0.0.0.1.1.1
.0.1.1.1.0.0.1.0
.0.1.1.1.0.1.0.0
.0.0.1.0.1.1.1.0
.0.1.0.0.1.1.1.0
.1.1.1.0.0.0.0.0
.1.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A191645 A146240 A112410 * A145371 A347750 A112044
KEYWORD
nonn
AUTHOR
STATUS
approved