A146180 Number of n X n binary arrays with all ones connected only in a 110-111-100 pattern in any orientation.

1, 1, 9, 33, 113, 1711, 59971, 1694043, 74822217, 7821008273, 1319866139817, 301739131956013, 120737110736027887

Offset

1,3

Links

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

Example

Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.1.1.1.0.1.1.0.0
.1.1.0.0.1.0.1.1
.0.1.0.0.0.1.1.1
.0.0.1.1.1.0.0.1
.0.1.0.1.1.0.1.0
.1.1.0.1.0.0.1.1
.1.1.1.0.0.1.1.1

Crossrefs

Sequence in context: A197359 A147155 A146232 * A221447 A147147 A147154

Adjacent sequences: A146177 A146178 A146179 * A146181 A146182 A146183

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved