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A147028 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 177, 345, 2505, 5729, 75825, 187849, 6215801, 19558129, 3054260057, 12287993577, 1988214768097, 9763619895845, 2194779047865427, 13072631855408245 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 9 X 9 example

.0.1.0.0.0.0.0.1.0

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.0.0.0.1.0

CROSSREFS

Sequence in context: A188537 A169641 A255786 * A105988 A292185 A083620

Adjacent sequences:  A147025 A147026 A147027 * A147029 A147030 A147031

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 29 21:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)