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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.

A139116 a(n) = p*(p-1)/2, where p is A000043(n).

Table of values

n a(n)
1 1
2 3
3 10
4 21
5 78
6 136
7 171
8 465
9 1830
10 3916
11 5671
12 8001
13 135460
14 183921
15 817281
16 2425503
17 2600340
18 5172936
19 9041878
20 9779253
21 46933516
22 49406770
23 62860078
24 198732016
25 235455850
26 269317236
27 989969256
28 3718884403
29 6105401253
30 8718403176
31 23347552095
32 286402257541

List of values

[1, 3, 10, 21, 78, 136, 171, 465, 1830, 3916, 5671, 8001, 135460, 183921, 817281, 2425503, 2600340, 5172936, 9041878, 9779253, 46933516, 49406770, 62860078, 198732016, 235455850, 269317236, 989969256, 3718884403, 6105401253, 8718403176, 23347552095, 286402257541]

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

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