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A147033
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 5, 31, 53, 91, 191, 751, 2485, 12125, 48629, 262319, 1174125, 7756611, 44436085, 360750867, 2552407571
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.0.0.1.1.0.1.0.0
.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0
.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1
.0.0.1.0.1.1.0.0
.0.0.1.0.0.1.0.0
CROSSREFS
Sequence in context: A130474 A238674 A245523 * A125743 A332788 A333243
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved