A146619 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1111 pattern in any orientation.

1, 1, 1, 7, 5, 29, 17, 229, 435, 11673, 13907, 525361, 673479, 94102915, 98332589, 24274612029, 24632647889, 11463377696197, 15275499402585, 14840749743707725, 19628783151131753, 35553199302440544313, 48796642845817392973

Offset

1,4

Links

Table of n, a(n) for n=1..23.

Example

Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.0.0.1.1.1.1.0.0
.1.1.0.0.0.0.1.1
.1.0.1.1.1.1.0.1
.1.0.1.0.0.1.0.1
.1.1.0.0.0.0.1.1
.0.0.1.0.0.1.0.0
.0.0.1.1.1.1.0.0

Crossrefs

Sequence in context: A226661 A120404 A334784 * A059990 A213246 A213243

Adjacent sequences: A146616 A146617 A146618 * A146620 A146621 A146622

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved