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A146587 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0110-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 549, 1019, 12531, 32807, 1040313, 3290973, 362333049, 1474237921, 266711200491, 1364122350485, 428284962927597, 2769561073160279, 1886319046954861837, 15405192560843785699, 21883415341502162253677 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..23.

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

.1.1.0.0.0.0.1.1

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A147052 A147132 A146840 * A147256 A147163 A147179

Adjacent sequences: A146584 A146585 A146586 * A146588 A146589 A146590

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 3 16:03 EST 2023. Contains 360035 sequences. (Running on oeis4.)