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A146832 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 581, 1207, 12059, 30137, 679043, 2023503, 130582091, 480701723, 55819325375, 254177839595, 55423651084473, 310968173764635, 105835960738614099, 725757107671271505 (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

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A147179 A146627 A146635 * A146699 A146707 A146643

Adjacent sequences:  A146829 A146830 A146831 * A146833 A146834 A146835

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 22 12:05 EDT 2021. Contains 348168 sequences. (Running on oeis4.)