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A146150
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.
0
1, 1, 1, 1, 1, 1, 11, 21, 45, 147, 455, 1443, 6641, 31711, 178915, 1031021, 7211761, 51418401, 452868901, 4229697689, 48322007005, 572003003167
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
CROSSREFS
Sequence in context: A333356 A127624 A097616 * A244069 A058489 A278780
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved