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A146857 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 249, 249, 3481, 3481, 80333, 80333, 1943801, 1943801, 59816323, 59816323 (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

.1.1.1.0.0.0.1.1.1

.1.0.1.1.0.1.1.0.1

.0.0.0.0.0.0.0.0.0

.1.0.1.1.0.1.1.0.1

.1.1.1.0.0.0.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147203 A146777 A147053 * A146668 A146732 A146588

Adjacent sequences: A146854 A146855 A146856 * A146858 A146859 A146860

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified December 8 14:17 EST 2022. Contains 358693 sequences. (Running on oeis4.)