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A146667 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 31, 603, 1115, 11773, 31193, 660175, 1987061, 224682951, 885526067, 157313783505, 768394153739, 158904168376893, 960773446522435, 410688920693142221, 3062625865459683273 (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

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A045700 A146800 A146731 * A146462 A089171 A279370

Adjacent sequences:  A146664 A146665 A146666 * A146668 A146669 A146670

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 30 13:47 EST 2021. Contains 349420 sequences. (Running on oeis4.)