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.

A289830 a(n) satisfies the equation n/(n-1) + a(n)/n! = H(n), where H(n) is the n-th harmonic number.

Table of values

n a(n)
2 -1
3 2
4 18
5 124
6 900
7 7188
8 63504
9 618336
10 6596640
11 76635360
12 963895680
13 13056819840
14 189581333760
15 2938083321600
16 48416639846400
17 845487698227200
18 15598004134809600
19 303161985274982400
20 6191998554470400000
21 132599321499875328000
22 2970952207377960960000

List of values

[-1, 2, 18, 124, 900, 7188, 63504, 618336, 6596640, 76635360, 963895680, 13056819840, 189581333760, 2938083321600, 48416639846400, 845487698227200, 15598004134809600, 303161985274982400, 6191998554470400000, 132599321499875328000, 2970952207377960960000]

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

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