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A147121
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 7, 23, 49, 87, 207, 721, 2133, 8229, 34269, 162105, 830967, 4627991, 26390809, 175258607
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.1.1.1
.1.0.0.0.1.1.0.0
.1.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.1
.0.0.1.1.0.0.0.1
.1.1.1.0.0.0.0.1
CROSSREFS
Sequence in context: A162290 A180044 A062725 * A098334 A299255 A038796
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved