A212531 Number of nondecreasing sequences of n 1..n integers with every element dividing the sequence sum

1, 2, 5, 10, 21, 40, 83, 161, 331, 644, 1102, 3627, 5646, 10083, 29188, 53681, 84121, 237453, 373114, 1400757, 2443494

Offset

1,2

Comments

Diagonal of A212536

Links

Table of n, a(n) for n=1..21.

Example

Some solutions for n=8
..1....2....2....2....1....1....1....1....2....1....1....1....4....6....1....2
..1....2....2....2....1....1....4....1....2....1....1....2....7....6....2....2
..2....2....2....2....4....2....4....1....4....1....1....2....7....6....3....2
..2....2....3....2....5....4....5....3....4....2....1....2....7....6....3....3
..4....2....5....2....5....4....5....3....4....3....2....3....7....6....3....3
..4....2....5....4....8....4....5....3....8....4....2....4....8....6....3....4
..7....4....5....7....8....4....8....6....8....4....2....4....8....6....3....4
..7....4....6....7....8....4....8....6....8....8....2....6....8....6....6....4

Crossrefs

Sequence in context: A306098 A056599 A191531 * A261681 A333798 A030525

Adjacent sequences: A212528 A212529 A212530 * A212532 A212533 A212534

Keyword

nonn

Author

R. H. Hardin May 20 2012

Status

approved