A212830 Number of 0..n arrays of length n+1 with no adjacent pair equal to its immediately preceding adjacent pair, and new values introduced in 0..n order.

2, 5, 13, 44, 168, 717, 3360, 17092, 93538, 546873, 3396379, 22300885, 154193327, 1118804486, 8493592723, 67288261914, 554996479921, 4756036642107, 42266543239132, 388879705390976, 3698606881082199, 36312877059583874

Offset: 1

Author

R. H. Hardin May 28 2012

Keywords

• nonn

Comments

Subdiagonal 1 of A212829

Examples

			Some solutions for n
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....1....1....1....1....1....1....1....1....0....1....1
..0....1....1....1....2....2....2....0....2....2....2....0....2....1....1....2
..0....2....2....2....0....3....1....2....1....3....0....2....0....1....2....3
..2....1....3....0....0....4....3....2....1....4....2....1....0....1....0....1
..3....1....3....1....3....4....3....2....2....2....3....1....2....2....3....4
..4....2....4....0....1....4....4....1....3....2....4....0....3....2....0....5
..0....2....5....0....1....0....5....1....3....0....5....0....3....0....0....1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..60