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A146134 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation. 0
1, 1, 1, 5, 17, 39, 241, 1589, 13237, 156057, 2242755, 43222843, 1066074605 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.1.1.0

.1.1.0.0.0.0.1.1

.1.0.0.1.1.0.0.0

.1.0.0.0.1.1.1.0

.0.1.1.1.0.0.0.1

.0.0.0.1.1.0.0.1

.1.1.0.0.0.0.1.1

.0.1.1.1.0.0.1.0

CROSSREFS

Sequence in context: A147467 A146272 A147035 * A011931 A260981 A078866

Adjacent sequences:  A146131 A146132 A146133 * A146135 A146136 A146137

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved

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Last modified August 18 16:13 EDT 2018. Contains 313833 sequences. (Running on oeis4.)