cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A320617 Number of ordered set partitions of [n] where k = four is minimal such that for each block b the smallest integer interval containing b has at most k elements.

Table of values

n a(n)
4 13
5 114
6 924
7 8152
8 79682
9 845874
10 9699504
11 119751978
12 1586912838
13 22489462512
14 339643322952
15 5448229269576
16 92547041455104
17 1660105401121800
18 31366215961317480
19 622755664408102200
20 12964583019385962840
21 282431877654287832480
22 6426548730391132252800

List of values

[13, 114, 924, 8152, 79682, 845874, 9699504, 119751978, 1586912838, 22489462512, 339643322952, 5448229269576, 92547041455104, 1660105401121800, 31366215961317480, 622755664408102200, 12964583019385962840, 282431877654287832480, 6426548730391132252800]