A146603 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 11, 177, 325, 3375, 7559, 107583, 279679, 10392307, 32537343, 2182245881, 8257920539, 997413109357, 4566791847617, 859237621422427, 4726361744374801, 1501159569808633603, 9908601381191408811

Offset

1,7

Links

Table of n, a(n) for n=1..24.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A147429 A147461 A146366 * A159003 A352004 A196509

Adjacent sequences: A146600 A146601 A146602 * A146604 A146605 A146606

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved