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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.

A330016 a(n) = Sum_{k=1..n} (-1)^(n - k) * H(k) * k!, where H(k) is the k-th harmonic number.

Table of values

n a(n)
0 0
1 1
2 2
3 9
4 41
5 233
6 1531
7 11537
8 98047
9 928529
10 9700111
11 110843729
12 1375599151
13 18427159889
14 265038487471
15 4074124514129
16 66660157879471
17 1156745432699729
18 21220242625821871
19 410344904191816529
20 8342603132569783471
21 177902207647600456529
22 3970574571687854263471

List of values

[0, 1, 2, 9, 41, 233, 1531, 11537, 98047, 928529, 9700111, 110843729, 1375599151, 18427159889, 265038487471, 4074124514129, 66660157879471, 1156745432699729, 21220242625821871, 410344904191816529, 8342603132569783471, 177902207647600456529, 3970574571687854263471]

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

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