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.

A051872 20-gonal (or icosagonal) numbers: a(n) = n*(9*n-8).

Table of values

n a(n)
0 0
1 1
2 20
3 57
4 112
5 185
6 276
7 385
8 512
9 657
10 820
11 1001
12 1200
13 1417
14 1652
15 1905
16 2176
17 2465
18 2772
19 3097
20 3440
21 3801
22 4180
23 4577
24 4992
25 5425
26 5876
27 6345
28 6832
29 7337
30 7860
31 8401
32 8960
33 9537
34 10132
35 10745
36 11376
37 12025
38 12692
39 13377
40 14080

List of values

[0, 1, 20, 57, 112, 185, 276, 385, 512, 657, 820, 1001, 1200, 1417, 1652, 1905, 2176, 2465, 2772, 3097, 3440, 3801, 4180, 4577, 4992, 5425, 5876, 6345, 6832, 7337, 7860, 8401, 8960, 9537, 10132, 10745, 11376, 12025, 12692, 13377, 14080]