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A146715 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 589, 1201, 14115, 35729, 829417, 2513431, 171871447, 646550497, 84488290479, 394701151631, 87164416237779, 501702351302759, 183326230223443813, 1292311484391232601 (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

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A146699 A146707 A146643 * A146848 A146611 A146398

Adjacent sequences:  A146712 A146713 A146714 * A146716 A146717 A146718

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 20 20:57 EDT 2021. Contains 348119 sequences. (Running on oeis4.)