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A146872 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1110-0100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 29, 597, 1065, 7937, 22829, 200213, 509041, 58873393, 209855541, 45265003821, 200942562233, 23496039620441, 129320692683437, 19050505005054181, 117997121583703345 (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

.1.0.0.0.0.0.0.1

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

.1.0.0.0.0.0.0.1

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A103304 A104067 A274023 * A146792 A124884 A052006

Adjacent sequences:  A146869 A146870 A146871 * A146873 A146874 A146875

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 28 04:00 EDT 2020. Contains 334671 sequences. (Running on oeis4.)