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A146633 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1010-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 25, 53, 269, 1425, 7687, 57643, 735315, 7616377, 142631981, 2418705027, 66038837775 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.0.1.0

.1.1.1.0.1.1.1.1

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

.1.1.1.1.0.1.1.1

.0.1.0.1.0.0.1.0

CROSSREFS

Sequence in context: A044015 A118304 A117472 * A123825 A349416 A157269

Adjacent sequences:  A146630 A146631 A146632 * A146634 A146635 A146636

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 22 02:46 EST 2022. Contains 350481 sequences. (Running on oeis4.)