A163688 Number of nX5 binary arrays with all 1s connected, a path of 1s from upper left corner to lower right corner, and no 1 having more than two 1s adjacent

1, 13, 83, 389, 1561, 5808, 21608, 81280, 302869, 1103582, 3937976, 13827871, 47923048, 164209208

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Example

All solutions for n=2
...1.0.0.0.0...1.0.0.0.1...1.1.0.0.0...1.1.0.0.1...1.1.1.0.0...1.1.1.0.0
...1.1.1.1.1...1.1.1.1.1...0.1.1.1.1...0.1.1.1.1...0.0.1.1.1...1.0.1.1.1
------
...1.1.1.0.1...1.1.1.0.1...1.1.1.1.0...1.1.1.1.0...1.1.1.1.1...1.1.1.1.1
...0.0.1.1.1...1.0.1.1.1...0.0.0.1.1...1.0.0.1.1...0.0.0.0.1...1.0.0.0.1
------
...1.0.1.1.1
...1.1.1.0.1

Crossrefs

Sequence in context: A101102 A213572 A142085 * A274398 A301953 A321589

Adjacent sequences: A163685 A163686 A163687 * A163689 A163690 A163691

Keyword

nonn

Author

R. H. Hardin Aug 03 2009

Status

approved