A146054 Number of n X n binary arrays with all ones connected only in a 2X3 U in any orientation.

1, 1, 9, 29, 153, 2069, 42313, 973281, 38746505, 2736250609, 283141781389, 43072398238613, 10634195356126331, 4171127160636409481, 2497710164925793120737

Offset

1,3

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.1.1.1.0.1.1.0.0
.1.0.1.0.1.0.1.1
.0.0.0.0.1.1.0.1
.1.0.1.0.0.0.1.1
.1.1.1.0.1.1.0.0
.0.0.0.0.1.0.1.1
.1.0.1.0.1.1.0.1
.1.1.1.0.0.0.1.1

Crossrefs

Sequence in context: A147282 A146602 A146413 * A321588 A173262 A337445

Adjacent sequences: A146051 A146052 A146053 * A146055 A146056 A146057

Keyword

nonn

Author

R. H. Hardin, Oct 26 2008

Status

approved