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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.

A213909 Sum of all even numbers in Collatz (3x+1) trajectory of n.

Table of values

n a(n)
1 0
2 2
3 40
4 6
5 30
6 46
7 234
8 14
9 276
10 40
11 212
12 58
13 100
14 248
15 562
16 30
17 178
18 294
19 424
20 60
21 126
22 234
23 516
24 82
25 538
26 126
27 81178
28 276
29 366
30 592
31 80910
32 62
33 688
34 212
35 446
36 330
37 444
38 462
39 1894
40 100
41 81096
42 168
43 1090
44 278
45 416
46 562
47 80816
48 130
49 666
50 588
51 926
52 178
53 340

List of values

[0, 2, 40, 6, 30, 46, 234, 14, 276, 40, 212, 58, 100, 248, 562, 30, 178, 294, 424, 60, 126, 234, 516, 82, 538, 126, 81178, 276, 366, 592, 80910, 62, 688, 212, 446, 330, 444, 462, 1894, 100, 81096, 168, 1090, 278, 416, 562, 80816, 130, 666, 588, 926, 178, 340]

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

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