A146635 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 573, 1143, 12157, 30947, 815741, 2476195, 202594803, 779485843, 111542186257, 533921262483, 123308337464907, 729814403884893, 315429715621991523, 2305738249128638897

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
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A147163 A147179 A146627 * A146832 A146699 A146707

Adjacent sequences: A146632 A146633 A146634 * A146636 A146637 A146638

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved