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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.

A355991 a(n) = n! * Sum_{k=1..n} 1/(k! * floor(n/k)!).

Table of values

n a(n)
1 1
2 2
3 5
4 12
5 57
6 158
7 1101
8 5442
9 28811
10 212502
11 2337513
12 9422306
13 122489967
14 1654319046
15 13917499277
16 111631450818
17 1897734663891
18 23705612782022
19 450406642858401
20 3091477152208002
21 51404897928720023
22 1130752882197523686
23 26007316290543044757

List of values

[1, 2, 5, 12, 57, 158, 1101, 5442, 28811, 212502, 2337513, 9422306, 122489967, 1654319046, 13917499277, 111631450818, 1897734663891, 23705612782022, 450406642858401, 3091477152208002, 51404897928720023, 1130752882197523686, 26007316290543044757]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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