A146643 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-1000 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 589, 1201, 13235, 33481, 725903, 2170199, 155541033, 580262243, 73632762107, 340925948339, 71000074991097, 403351898789271, 137271400195382005, 952292305731741997

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
.0.1.1.0.0.1.1.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A146832 A146699 A146707 * A146715 A146848 A146611

Adjacent sequences: A146640 A146641 A146642 * A146644 A146645 A146646

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved