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A146732 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 253, 253, 4269, 4269, 109305, 109305, 2719409, 2719409, 106590781, 106590781 (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

.0.1.0.0.0.0.0.1.0

.0.1.1.1.0.1.1.1.0

.1.1.1.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.1.1.1

.0.1.1.1.0.1.1.1.0

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147053 A146857 A146668 * A146588 A146628 A146636

Adjacent sequences:  A146729 A146730 A146731 * A146733 A146734 A146735

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 25 16:01 EST 2022. Contains 350572 sequences. (Running on oeis4.)