A243721 Number of length n+2 0..n arrays with no three unequal elements in a row and no three equal elements in a row and new values 0..n introduced in 0..n order

3, 6, 12, 25, 53, 116, 259, 594, 1389, 3323, 8095, 20113, 50814, 130632, 341034, 904331, 2432412, 6636112, 18345413, 51381635, 145691912, 418131443, 1213928928, 3564262737, 10579009345, 31733010233, 96162631881, 294324273852

Offset

1,1

Comments

Diagonal of A243729

Links

R. H. Hardin, Table of n, a(n) for n = 1..209

Example

Some solutions for n=6
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....0....0....1....0....1....0....0....1....1....1....1....0....1
..1....0....1....1....1....0....1....1....1....1....0....0....0....0....1....0
..2....0....2....1....0....1....0....2....0....0....0....0....1....0....0....0
..1....2....1....2....0....1....1....2....0....1....2....1....1....2....0....2
..2....2....1....2....2....0....0....0....1....1....2....0....2....2....2....0
..2....0....0....0....0....1....0....0....0....0....3....1....1....0....2....0
..1....0....0....2....0....0....2....2....1....0....2....1....2....2....3....3

Crossrefs

Sequence in context: A243726 A243727 A243728 * A280109 A099445 A004067

Adjacent sequences: A243718 A243719 A243720 * A243722 A243723 A243724

Keyword

nonn

Author

R. H. Hardin, Jun 09 2014

Status

approved