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A146822 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1110-0111 pattern in any orientation. 0
1, 1, 1, 1, 5, 21, 63, 331, 1837, 11817, 91941, 951301, 13059325, 223458589, 4681971763 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.1.0.1.1.0.1.1.0

.1.1.0.1.1.0.1.1

.1.1.0.1.1.0.1.1

.0.1.1.0.1.0.0.1

.1.0.0.1.0.1.1.0

.1.1.0.1.1.0.1.1

.1.1.0.1.1.0.1.1

.0.1.1.0.1.1.0.1

CROSSREFS

Sequence in context: A147216 A196631 A342379 * A146223 A181093 A055384

Adjacent sequences:  A146819 A146820 A146821 * A146823 A146824 A146825

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 29 05:09 EST 2022. Contains 350672 sequences. (Running on oeis4.)