A146189 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 101-111-100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 117, 259, 2279, 5789, 60955, 163861, 9576387, 34012697, 10076483081, 49427387999, 9949697912705, 60225158985931, 15793067759502057, 116501021735138203, 110213762112932651169, 1030724751585178353123

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.1.1.0.0.1.1.0
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1

Crossrefs

Sequence in context: A351574 A031174 A146172 * A063332 A063338 A304611

Adjacent sequences: A146186 A146187 A146188 * A146190 A146191 A146192

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved