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A146729
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.
0
1, 1, 1, 1, 17, 35, 131, 817, 4781, 41379, 493009, 5930505, 104085935, 2108933179
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.1.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.1
.0.0.0.0.0.0.0.0
.1.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.1
.0.0.0.0.0.0.0.0
.1.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.1
CROSSREFS
Sequence in context: A198587 A041570 A041572 * A041574 A144534 A041576
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved