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A147017
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 15, 21, 45, 77, 277, 567, 2577, 6557, 31507, 89591, 535509, 1822317, 13376361, 54721945, 461666973, 2203494951, 22033823051
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.1.1.0.1.1.1.1.1
.0.1.0.0.1.0.0.0
.0.1.1.0.0.0.1.0
.0.1.0.0.0.1.1.0
.0.0.0.1.0.0.1.0
.1.1.1.1.1.0.1.1
.0.1.0.0.0.0.1.0
CROSSREFS
Sequence in context: A261274 A014493 A147025 * A171570 A350987 A076825
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved