A146658 Number of n X n binary arrays with all ones connected only in a 1100-0111-0001 pattern in any orientation.

1, 1, 1, 17, 73, 521, 7411, 207693, 7583663, 399906057, 35432211775

Offset

1,4

Links

Table of n, a(n) for n=1..11.

Example

Maximal 8 X 8 example
.0.1.1.0.1.1.0.1
.0.1.0.0.1.0.1.1
.1.1.0.1.1.0.1.0
.1.0.0.1.0.1.1.0
.0.1.1.0.1.0.0.1
.0.1.0.1.1.0.1.1
.1.1.0.1.0.0.1.0
.1.0.1.1.0.1.1.0

Crossrefs

Sequence in context: A096637 A201610 A201262 * A145440 A112013 A165691

Adjacent sequences: A146655 A146656 A146657 * A146659 A146660 A146661

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved