A146188 Number of n X n binary arrays with all ones connected only in a 101-111-100 pattern in any orientation.

1, 1, 9, 33, 89, 973, 38577, 1078541, 28644797, 2049754535, 324959092887, 58338532772401, 13434523893685925

Offset

1,3

Links

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

Example

Maximal 8 X 8 example
.1.0.1.0.1.0.1.0
.1.1.1.0.1.1.1.0
.1.0.0.0.1.0.0.1
.0.1.0.1.0.1.1.1
.0.1.1.1.0.1.0.1
.1.0.0.1.0.0.1.0
.1.1.1.0.1.1.1.0
.1.0.1.0.1.0.1.0

Crossrefs

Sequence in context: A005920 A020324 A146171 * A020228 A005939 A020326

Adjacent sequences: A146185 A146186 A146187 * A146189 A146190 A146191

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved