A146406 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 669, 1435, 18911, 48821, 1583279, 5119381, 552048095, 2284826569, 405071372171, 2114490125109, 687967929796833, 4506360355608779, 2940096330466050229, 24177384329604438229

Offset

1,7

Links

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

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
.0.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.0
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A146848 A146611 A146398 * A066470 A054478 A136198

Adjacent sequences: A146403 A146404 A146405 * A146407 A146408 A146409

Keyword

nonn

Author

R. H. Hardin

Status

approved