A145964 Number of n X n binary arrays with all ones connected only in a one by five or five by one block.

1, 1, 1, 1, 25, 173, 1794, 20685, 319727, 6676539, 232552310, 11372993795

Offset

1,5

Links

Table of n, a(n) for n=1..12.

Example

Maximal 8 X 8 example
.0.0.0.1.1.1.1.1
.1.0.1.0.0.0.0.0
.1.0.1.0.0.1.0.0
.1.0.1.0.0.1.0.1
.1.0.1.0.0.1.0.1
.1.0.1.0.0.1.0.1
.0.0.0.0.0.1.0.1
.1.1.1.1.1.0.0.1

Crossrefs

Sequence in context: A120096 A115330 A213546 * A020250 A201089 A020277

Adjacent sequences: A145961 A145962 A145963 * A145965 A145966 A145967

Keyword

nonn

Author

R. H. Hardin, Oct 25 2008

Status

approved