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A146577
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-0100-1111 pattern in any orientation.
0
1, 1, 1, 1, 5, 17, 71, 385, 1763, 10689, 97117, 1072429, 14923393, 247249411, 5297126647, 138340878961
OFFSET
1,5
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.1.1.1.1
.1.1.1.1.0.0.0.0
.0.0.0.0.1.1.1.1
.1.1.1.1.0.0.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A149715 A149716 A324800 * A211405 A354040 A187823
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved