A268326 Number of length-(n+1) 0..7 arrays with new values introduced in sequential order, and with new repeated values introduced in sequential order, both starting with zero.

2, 4, 11, 33, 114, 435, 1829, 8376, 41466, 220115, 1242614, 7395663, 45999012, 296480813, 1965371333, 13314182333, 91697130971, 639451012407, 4501167824269, 31908164747227, 227399949031725, 1627202389749190, 11680282747792917

Offset: 1

Author

R. H. Hardin, Feb 01 2016

Keywords

• nonn

Comments

Column 7 of A268327.

Examples

			Some solutions for n=9
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....0....1....1....1....1....1....1....0....1....1....0
..2....0....2....0....2....1....2....0....2....2....2....0....1....2....0....1
..3....1....1....1....3....1....3....0....1....1....3....0....2....3....2....0
..4....2....3....2....4....0....1....1....0....3....1....0....3....1....3....2
..5....3....1....3....2....2....2....1....3....4....3....0....2....2....2....0
..1....0....4....2....1....3....4....2....0....0....0....2....4....1....4....2
..4....2....1....4....0....4....2....3....3....5....4....0....3....4....2....1
..5....0....5....0....0....1....3....4....2....3....1....3....5....5....1....0
..6....4....4....5....1....5....0....2....3....1....3....4....3....4....2....3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 54

Crossrefs

Cf. A268327.

Formula

Empirical recurrence of order 54 (see link above)