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.

A161809 G.f.: A(x) = exp( Sum_{n>=1} 3*A038500(n) * x^n/n ), where A038500 is the highest power of 3 dividing n.

Table of values

n a(n)
0 1
1 3
2 6
3 12
4 21
5 33
6 51
7 75
8 105
9 147
10 201
11 267
12 354
13 462
14 591
15 753
16 948
17 1176
18 1455
19 1785
20 2166
21 2622
22 3153
23 3759
24 4470
25 5286
26 6207
27 7275
28 8490
29 9852
30 11415
31 13179
32 15144
33 17376
34 19875
35 22641
36 25761
37 29235
38 33063
39 37353
40 42105
41 47319
42 53124

List of values

[1, 3, 6, 12, 21, 33, 51, 75, 105, 147, 201, 267, 354, 462, 591, 753, 948, 1176, 1455, 1785, 2166, 2622, 3153, 3759, 4470, 5286, 6207, 7275, 8490, 9852, 11415, 13179, 15144, 17376, 19875, 22641, 25761, 29235, 33063, 37353, 42105, 47319, 53124]