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A146659 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 19, 31, 777, 1691, 27963, 75639, 2292715, 7576569, 826036495, 3496134625, 778953197867, 4202373389229, 1495755903085789, 10132125701626967, 6580332072056181975, 55813749926331270805 (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

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A147240 A147210 A146816 * A160220 A133151 A184750

Adjacent sequences:  A146656 A146657 A146658 * A146660 A146661 A146662

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 11 15:10 EDT 2022. Contains 356066 sequences. (Running on oeis4.)