A267225 Number of length-n 0..n arrays with no following elements greater than or equal to the first repeated value.

2, 9, 54, 470, 5375, 76237, 1291052, 25415028, 570177387, 14358031083, 400970609974, 12297528376718, 410864493836407, 14852560618944921, 577574220388332600, 24040616483779262824, 1066403330800172463507

Offset

1,1

Comments

Diagonal of A267232.

Links

R. H. Hardin, Table of n, a(n) for n = 1..206

Example

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

Crossrefs

Cf. A267232.

Sequence in context: A064151 A075679 A001757 * A078455 A366177 A355281

Adjacent sequences: A267222 A267223 A267224 * A267226 A267227 A267228

Keyword

nonn

Author

R. H. Hardin, Jan 12 2016

Status

approved