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A146388 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1111 pattern in any orientation. 0
1, 1, 1, 1, 9, 20, 73, 328, 1655, 10746, 103583, 974458, 13360226, 192146495, 4002035013, 89158887545, 2840078369454 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.1.1.1.1

.1.1.1.1.0.1.1.0

.0.0.0.0.0.0.0.0

.0.1.1.0.1.1.1.1

.1.1.1.1.0.1.1.0

.0.0.0.0.0.0.0.0

.0.1.1.0.1.1.1.1

.1.1.1.1.0.1.1.0

CROSSREFS

Sequence in context: A249044 A109805 A013573 * A230833 A321723 A282763

Adjacent sequences:  A146385 A146386 A146387 * A146389 A146390 A146391

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 21 15:00 EDT 2019. Contains 328301 sequences. (Running on oeis4.)