A146784 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 31, 615, 1219, 16139, 42305, 1128827, 3502811, 254593369, 985218883, 138612115423, 664622922147, 144116871368241, 849726636226171, 336332191825755637

Offset

1,7

Links

Table of n, a(n) for n=1..21.

Example

Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.1.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A139847 A087764 A146691 * A147240 A147210 A146816

Adjacent sequences: A146781 A146782 A146783 * A146785 A146786 A146787

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved