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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.

A178238 Triangle read by rows: partial column sums of the triangle of natural numbers (written sequentially by rows).

Table of values

n a(n)
1 1
2 3
3 3
4 7
5 8
6 6
7 14
8 16
9 15
10 10
11 25
12 28
13 28
14 24
15 15
16 41
17 45
18 46
19 43
20 35
21 21
22 63
23 68
24 70
25 68
26 61
27 48
28 28
29 92
30 98
31 101
32 100
33 94
34 82
35 63
36 36
37 129
38 136
39 140
40 140
41 135
42 124
43 106
44 80
45 45
46 175
47 183
48 188
49 189
50 185
51 175
52 158
53 133
54 99
55 55
56 231
57 240
58 246
59 248
60 245
61 236
62 220
63 196
64 163
65 120
66 66

List of values

[1, 3, 3, 7, 8, 6, 14, 16, 15, 10, 25, 28, 28, 24, 15, 41, 45, 46, 43, 35, 21, 63, 68, 70, 68, 61, 48, 28, 92, 98, 101, 100, 94, 82, 63, 36, 129, 136, 140, 140, 135, 124, 106, 80, 45, 175, 183, 188, 189, 185, 175, 158, 133, 99, 55, 231, 240, 246, 248, 245, 236, 220, 196, 163, 120, 66]

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

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