A146831 Number of n X n binary arrays with all ones connected only in a 1001-1111-0100 pattern in any orientation.

1, 1, 1, 17, 49, 317, 3643, 63437, 1864637, 68228177, 3719926503, 324717444923, 42997787423811

Offset

1,4

Links

Table of n, a(n) for n=1..13.

Example

Maximal 8 X 8 example
.1.0.0.1.0.0.0.0
.1.1.1.1.0.1.1.0
.0.1.0.0.0.0.1.0
.0.0.0.0.0.0.1.1
.1.1.0.0.0.1.1.0
.0.1.1.0.1.0.0.0
.0.1.0.1.1.1.1.0
.1.1.0.1.0.0.1.0

Crossrefs

Sequence in context: A146586 A146626 A146634 * A146698 A146706 A120612

Adjacent sequences: A146828 A146829 A146830 * A146832 A146833 A146834

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved