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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.

A231687 a(n) = Sum_{i=0..n} digsum_9(i)^4, where digsum_9(i) = A053830(i).

Table of values

n a(n)
0 0
1 1
2 17
3 98
4 354
5 979
6 2275
7 4676
8 8772
9 8773
10 8789
11 8870
12 9126
13 9751
14 11047
15 13448
16 17544
17 24105
18 24121
19 24202
20 24458
21 25083
22 26379
23 28780
24 32876
25 39437
26 49437
27 49518
28 49774
29 50399
30 51695
31 54096
32 58192
33 64753
34 74753
35 89394
36 89650
37 90275
38 91571
39 93972
40 98068
41 104629
42 114629
43 129270
44 150006
45 150631
46 151927
47 154328
48 158424
49 164985
50 174985
51 189626
52 210362
53 238923

List of values

[0, 1, 17, 98, 354, 979, 2275, 4676, 8772, 8773, 8789, 8870, 9126, 9751, 11047, 13448, 17544, 24105, 24121, 24202, 24458, 25083, 26379, 28780, 32876, 39437, 49437, 49518, 49774, 50399, 51695, 54096, 58192, 64753, 74753, 89394, 89650, 90275, 91571, 93972, 98068, 104629, 114629, 129270, 150006, 150631, 151927, 154328, 158424, 164985, 174985, 189626, 210362, 238923]

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