A146832 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 581, 1207, 12059, 30137, 679043, 2023503, 130582091, 480701723, 55819325375, 254177839595, 55423651084473, 310968173764635, 105835960738614099, 725757107671271505

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
.0.1.1.0.0.1.1.0
.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: A147179 A146627 A146635 * A146699 A146707 A146643

Adjacent sequences: A146829 A146830 A146831 * A146833 A146834 A146835

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved