A320616 Number of ordered set partitions of [n] where k = three is minimal such that for each block b the smallest integer interval containing b has at most k elements.

3, 18, 118, 878, 7224, 65514, 652446, 7092672, 83679936, 1065839544, 14586155400, 213544496760, 3331500035160, 55190744651520, 967799429431920, 17911992891306240, 348981340420308960, 7140367412382592080, 153090240159322655280, 3432492956469166894080

Offset

3,1

Links

Alois P. Heinz, Table of n, a(n) for n = 3..450

Crossrefs

Column k=3 of A276891.

Cf. A320553.

Sequence in context: A196865 A153394 A334682 * A009065 A109714 A118348

Adjacent sequences: A320613 A320614 A320615 * A320617 A320618 A320619

Keyword

nonn

Author

Alois P. Heinz, Oct 17 2018

Status

approved