A268320 Number of length-(n+1) 0..n 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, 8377, 41504, 220958, 1256927, 7602273, 48676925, 328685063, 2332565079, 17344752142, 134774766541, 1091701884974, 9198355199792, 80459135884925, 729337831748484, 6840215461149149

Offset: 1

Author

R. H. Hardin, Feb 01 2016

Keywords

• nonn

Comments

Diagonal 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....0....0....1....1....1....0....1....1....1....1....0....1....1....1....1
..2....0....1....0....2....2....1....2....2....2....2....0....2....2....2....2
..3....1....2....2....0....3....2....3....1....3....3....0....3....1....3....3
..4....2....1....0....0....2....1....0....3....4....4....1....4....3....4....2
..0....1....2....3....3....4....2....4....1....5....2....0....1....4....5....3
..1....3....3....4....4....3....1....0....0....6....5....2....2....0....6....2
..5....1....2....3....5....4....1....4....0....1....3....1....0....4....0....4
..2....2....0....2....3....3....2....5....3....6....6....3....5....1....4....5
..3....4....2....5....6....4....1....4....1....7....5....0....3....0....7....6
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..147

Crossrefs

Cf. A268327.