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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.

A111074 Let t(n) denote the triangular numbers (A000217). Sequence mixes t(n+2) and t(n).

Table of values

n a(n)
0 3
1 0
2 6
3 1
4 10
5 3
6 15
7 6
8 21
9 10
10 28
11 15
12 36
13 21
14 45
15 28
16 55
17 36
18 66
19 45
20 78
21 55
22 91
23 66
24 105
25 78
26 120
27 91
28 136
29 105
30 153
31 120
32 171
33 136
34 190
35 153
36 210
37 171
38 231
39 190
40 253
41 210
42 276
43 231
44 300
45 253
46 325
47 276
48 351
49 300
50 378
51 325
52 406
53 351
54 435
55 378
56 465
57 406
58 496
59 435

List of values

[3, 0, 6, 1, 10, 3, 15, 6, 21, 10, 28, 15, 36, 21, 45, 28, 55, 36, 66, 45, 78, 55, 91, 66, 105, 78, 120, 91, 136, 105, 153, 120, 171, 136, 190, 153, 210, 171, 231, 190, 253, 210, 276, 231, 300, 253, 325, 276, 351, 300, 378, 325, 406, 351, 435, 378, 465, 406, 496, 435]

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

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