A243634 Number of length n+2 0..n arrays with no three unequal elements in a row and new values 0..n introduced in 0..n order.

4, 9, 21, 51, 127, 324, 844, 2243, 6073, 16737, 46905, 133556, 386062, 1132107, 3365627, 10137559, 30920943, 95457178, 298128278, 941574417, 3006040523, 9697677885, 31602993021, 104001763258, 345524136076, 1158570129917

Offset: 1

Author

R. H. Hardin, Jun 08 2014

Keywords

• nonn

Comments

Diagonal of A243641.

Examples

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

Links

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

Crossrefs

Cf. A247100.