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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.

A356015 a(n) = n! * Sum_{k=1..n} 1/(k * floor(n/k)!).

Table of values

n a(n)
1 1
2 2
3 6
4 21
5 125
6 625
7 5089
8 38185
9 343657
10 3376081
11 40765681
12 427649761
13 6038448481
14 84486386881
15 1252766088001
16 19388604009601
17 350529058051201
18 5938944734419201
19 119242323659692801
20 2303746722596390401
21 48358406991122726401
22 1063884813011759692801

List of values

[1, 2, 6, 21, 125, 625, 5089, 38185, 343657, 3376081, 40765681, 427649761, 6038448481, 84486386881, 1252766088001, 19388604009601, 350529058051201, 5938944734419201, 119242323659692801, 2303746722596390401, 48358406991122726401, 1063884813011759692801]

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

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