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A147245
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-0111-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 9, 17, 43, 77, 187, 693, 2641, 10331, 50859, 230621, 1381217, 7944835, 57500635, 415589871, 3698671025
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.0.1.1.0
.1.0.0.1.1.1.0.0
.1.1.0.0.1.0.0.0
.0.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.0
.0.0.0.1.0.0.1.1
.0.0.1.1.1.0.0.1
.0.1.1.0.1.0.0.0
CROSSREFS
Sequence in context: A145941 A245542 A186298 * A146625 A318755 A146576
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved