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

1,1

Comments

Diagonal of A268327.

Links

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

Example

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

Crossrefs

Cf. A268327.

Sequence in context: A268324 A268325 A268326 * A127782 A002846 A188478

Adjacent sequences: A268317 A268318 A268319 * A268321 A268322 A268323

Keyword

nonn

Author

R. H. Hardin, Feb 01 2016

Status

approved