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A147176
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 5, 25, 49, 81, 173, 659, 1949, 6591, 26979, 151047, 720521, 4123761, 21126009, 143739573
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.1.0.0.0.0.0.1
.0.1.0.0.1.1.1.1
.0.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.0
.1.1.1.1.0.0.1.0
.1.0.0.0.0.0.1.1
CROSSREFS
Sequence in context: A364584 A223222 A273789 * A298041 A074493 A262760
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved