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A146619 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1111 pattern in any orientation. 0
1, 1, 1, 7, 5, 29, 17, 229, 435, 11673, 13907, 525361, 673479, 94102915, 98332589, 24274612029, 24632647889, 11463377696197, 15275499402585, 14840749743707725, 19628783151131753, 35553199302440544313, 48796642845817392973 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.0.0

.0.0.1.1.1.1.0.0

.1.1.0.0.0.0.1.1

.1.0.1.1.1.1.0.1

.1.0.1.0.0.1.0.1

.1.1.0.0.0.0.1.1

.0.0.1.0.0.1.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A226661 A120404 A334784 * A059990 A213246 A213243

Adjacent sequences:  A146616 A146617 A146618 * A146620 A146621 A146622

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 3 10:36 EDT 2022. Contains 357231 sequences. (Running on oeis4.)