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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.

A220907 a(n) = n*p(n)-spt(n) (= n*A000041(n) - A092269(n)).

Table of values

n a(n)
1 0
2 1
3 4
4 10
5 21
6 40
7 70
8 119
9 190
10 301
11 455
12 686
13 998
14 1450
15 2051
16 2895
17 4001
18 5523
19 7490
20 10141
21 13545
22 18046
23 23773
24 31255
25 40687
26 52850
27 68105
28 87542
29 111755
30 142347
31 180205
32 227622
33 286027
34 358580
35 447482
36 557235
37 691016
38 855131
39 1054375
40 1297352
41 1591060

List of values

[0, 1, 4, 10, 21, 40, 70, 119, 190, 301, 455, 686, 998, 1450, 2051, 2895, 4001, 5523, 7490, 10141, 13545, 18046, 23773, 31255, 40687, 52850, 68105, 87542, 111755, 142347, 180205, 227622, 286027, 358580, 447482, 557235, 691016, 855131, 1054375, 1297352, 1591060]

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

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