A146576 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 17, 45, 73, 207, 751, 2857, 11091, 59153, 255007, 1772283, 9573705, 76401883, 527044113, 5085713425, 43721092953

Offset

1,7

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.1.0
.1.1.1.1.0.0.1.0
.0.0.1.0.1.1.1.0
.0.0.1.0.0.0.1.0
.0.1.0.0.0.1.0.0
.0.1.1.1.0.1.0.0
.0.1.0.0.1.1.1.1
.0.1.0.0.0.0.0.0

Crossrefs

Sequence in context: A147245 A146625 A318755 * A147138 A282764 A319018

Adjacent sequences: A146573 A146574 A146575 * A146577 A146578 A146579

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved