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A146784 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 19, 31, 615, 1219, 16139, 42305, 1128827, 3502811, 254593369, 985218883, 138612115423, 664622922147, 144116871368241, 849726636226171, 336332191825755637 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.0.1.1

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A139847 A087764 A146691 * A147240 A147210 A146816

Adjacent sequences:  A146781 A146782 A146783 * A146785 A146786 A146787

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 19 23:59 EDT 2022. Contains 356231 sequences. (Running on oeis4.)