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A146643 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 589, 1201, 13235, 33481, 725903, 2170199, 155541033, 580262243, 73632762107, 340925948339, 71000074991097, 403351898789271, 137271400195382005, 952292305731741997 (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

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A146832 A146699 A146707 * A146715 A146848 A146611

Adjacent sequences:  A146640 A146641 A146642 * A146644 A146645 A146646

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 22 18:45 EDT 2021. Contains 348175 sequences. (Running on oeis4.)