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A146627 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 573, 1143, 12133, 30945, 812099, 2463251, 205843047, 793610117, 114751333899, 550658503225, 126710497064071, 751070142241727, 321642812339840537, 2354725099172800861 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A147256 A147163 A147179 * A146635 A146832 A146699

Adjacent sequences:  A146624 A146625 A146626 * A146628 A146629 A146630

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 27 09:19 EST 2021. Contains 349365 sequences. (Running on oeis4.)