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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.

A338758 a(n) is the sum of even-indexed terms (of every row) of first n rows of the triangle A237591.

Table of values

n a(n)
1 0
2 0
3 1
4 2
5 4
6 5
7 7
8 9
9 11
10 14
11 18
12 21
13 25
14 30
15 34
16 38
17 43
18 48
19 54
20 59
21 65
22 72
23 80
24 87
25 94
26 102
27 111
28 119
29 128
30 136
31 145
32 154
33 164
34 175
35 185
36 195
37 206
38 218
39 231
40 243
41 256
42 268
43 281
44 295
45 308
46 322
47 337
48 351
49 365
50 379
51 394
52 410
53 427
54 443
55 460
56 476
57 493
58 511
59 530
60 548
61 567
62 587
63 606
64 625

List of values

[0, 0, 1, 2, 4, 5, 7, 9, 11, 14, 18, 21, 25, 30, 34, 38, 43, 48, 54, 59, 65, 72, 80, 87, 94, 102, 111, 119, 128, 136, 145, 154, 164, 175, 185, 195, 206, 218, 231, 243, 256, 268, 281, 295, 308, 322, 337, 351, 365, 379, 394, 410, 427, 443, 460, 476, 493, 511, 530, 548, 567, 587, 606, 625]

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

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