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A146628 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 309, 309, 4157, 4157, 84741, 84741, 2465029, 2465029, 97708135, 97708135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.1.0.1.0.0.0.1.0.1

.0.0.0.0.0.0.0.0.0

.1.0.1.0.0.0.1.0.1

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146668 A146732 A146588 * A146636 A146833 A146700

Adjacent sequences:  A146625 A146626 A146627 * A146629 A146630 A146631

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 19 22:12 EST 2022. Contains 350466 sequences. (Running on oeis4.)