A268454 Number of length-n 0..5 arrays with no adjacent pair x,x+1 followed at any distance by x+1,x.

6, 36, 211, 1231, 7160, 41526, 240170, 1385338, 7970326, 45742764, 261899866, 1496074920, 8527336280, 48500972230, 275294704851, 1559507239653, 8817578095886, 49763675574292, 280352403988287, 1576707102660739

Offset: 1

Author

R. H. Hardin, Feb 04 2016

Keywords

• nonn

Comments

Column 5 of A268457.

Examples

			Some solutions for n=6
..4....1....1....0....5....2....5....4....1....4....5....3....0....4....5....0
..0....5....0....0....5....1....5....2....4....5....2....3....2....2....4....4
..3....2....0....0....5....5....4....2....0....3....4....5....3....3....0....5
..5....3....5....2....0....5....2....4....0....2....3....0....5....0....5....1
..0....4....4....3....1....1....5....4....4....1....2....4....2....2....1....1
..4....0....5....4....1....1....0....1....4....1....4....2....1....4....0....3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 51

Crossrefs

Cf. A268457.

Formula

Empirical recurrence of order 51 (see link above)