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

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