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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.

A122057 a(n) = (n+1)! * (H(n+1) - H(2)), where H(n) are the harmonic numbers.

Table of values

n a(n)
1 0
2 2
3 14
4 94
5 684
6 5508
7 49104
8 482256
9 5185440
10 60668640
11 767940480
12 10462227840
13 152698210560
14 2377651449600
15 39350097561600
16 689874448435200
17 12773427499929600
18 249097496204390400
19 5103595024496640000
20 109608397522606080000
21 2462475687669043200000

List of values

[0, 2, 14, 94, 684, 5508, 49104, 482256, 5185440, 60668640, 767940480, 10462227840, 152698210560, 2377651449600, 39350097561600, 689874448435200, 12773427499929600, 249097496204390400, 5103595024496640000, 109608397522606080000, 2462475687669043200000]

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

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