cp's OEIS Frontend

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.

A259604 (A259542(n) + A259542(n+1)) / 2.

Table of values

n a(n)
1 3
2 6
3 10
4 15
5 10
6 6
7 10
8 15
9 21
10 28
11 36
12 45
13 36
14 28
15 36
16 45
17 55
18 36
19 21
20 28
21 36
22 45
23 36
24 28
25 36
26 45
27 55
28 66
29 78
30 91
31 78
32 66
33 78
34 91
35 105
36 78
37 55
38 66
39 78
40 91
41 78
42 66
43 78
44 91
45 105
46 120
47 136
48 153
49 120
50 78
51 91
52 105
53 91
54 78
55 66
56 78
57 105
58 120
59 136
60 153
61 171
62 153

List of values

[3, 6, 10, 15, 10, 6, 10, 15, 21, 28, 36, 45, 36, 28, 36, 45, 55, 36, 21, 28, 36, 45, 36, 28, 36, 45, 55, 66, 78, 91, 78, 66, 78, 91, 105, 78, 55, 66, 78, 91, 78, 66, 78, 91, 105, 120, 136, 153, 120, 78, 91, 105, 91, 78, 66, 78, 105, 120, 136, 153, 171, 153]