A147028 - OEIS

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.

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

.0.0.0.0.0.0.0.0.0

.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