A146136 Number of n X n binary arrays with all ones connected only in a 5-point barb 1,1 1,2 2,2 2,3 3,2 in any orientation.

1, 1, 9, 33, 153, 3123, 118071, 4682615, 398324801, 67438703311, 18607359075661, 8942742118054707, 7834339576388147577

Offset

1,3

Links

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

Example

Maximal 8 X 8 example
.0.1.1.0.0.0.1.0
.1.1.0.0.0.1.1.1
.0.1.0.0.1.0.0.1
.0.0.0.0.1.1.1.0
.0.1.1.0.0.1.0.0
.1.1.0.1.0.0.1.0
.0.1.0.1.1.0.1.1
.0.0.1.1.0.1.1.0

Crossrefs

Sequence in context: A147275 A140413 A097804 * A264258 A147444 A189179

Adjacent sequences: A146133 A146134 A146135 * A146137 A146138 A146139

Keyword

nonn

Author

R. H. Hardin, Oct 27 2008

Status

approved