A324918 Partial sums of A324917.

1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 10, 10, 10, 10, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 23, 23, 24

Offset

1,9

Comments

Conjecture: lim_{n--> infinity}(log(a(n))/log(n)) exists and is positive.

Conjecture: a(n) >= A324965(n) for all n >= 13.

Links

Table of n, a(n) for n=1..69.

C. Defant, Counting 3-stack-sortable permutations, arXiv:1903.09138 [math.CO], 2019.

Example

The first 10 terms of A324917 are 1, 0, 0, 0, 0, 0, 0, 0, 1, 0. These terms sum to 2, so a(10)=2.

Crossrefs

Cf. A324917, A324965.

Sequence in context: A071903 A091372 A185322 * A068980 A280950 A279135

Adjacent sequences: A324915 A324916 A324917 * A324919 A324920 A324921

Keyword

nonn

Author

Colin Defant, Mar 18 2019

Status

approved