A212869 Number of nondecreasing sequences of n 1..n+1 integers with no element dividing the sequence sum

0, 1, 3, 15, 52, 199, 722, 2693, 10052, 37344, 141943, 528323, 2020746, 7720299, 29535575, 112041465, 434810382, 1666519344, 6447232492, 24895996003, 96654652273

Offset

1,3

Comments

Superdiagonal 1 of A212868

Links

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

Example

All solutions for n=4
..2....4....3....3....3....2....2....3....3....2....2....4....4....2....2
..2....5....3....3....3....2....2....4....3....5....3....4....4....3....3
..4....5....4....3....5....3....2....5....3....5....4....5....4....3....3
..5....5....4....5....5....4....5....5....4....5....4....5....5....5....3

Crossrefs

Sequence in context: A192742 A166035 A038192 * A371481 A332375 A298178

Adjacent sequences: A212866 A212867 A212868 * A212870 A212871 A212872

Keyword

nonn

Author

R. H. Hardin May 29 2012

Status

approved