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.

A304335 Sum of digits of (2*n-1)!!.

Table of values

n a(n)
0 1
1 1
2 3
3 6
4 6
5 18
6 18
7 18
8 18
9 36
10 45
11 45
12 36
13 63
14 72
15 72
16 90
17 90
18 108
19 108
20 126
21 108
22 144
23 144
24 135
25 144
26 153
27 180
28 180
29 171
30 180
31 198
32 198
33 189
34 216
35 243
36 243
37 234
38 252
39 225
40 243
41 261
42 252
43 297
44 306
45 333
46 360
47 324
48 342
49 342
50 315
51 360
52 369
53 378
54 396
55 387
56 387
57 414

List of values

[1, 1, 3, 6, 6, 18, 18, 18, 18, 36, 45, 45, 36, 63, 72, 72, 90, 90, 108, 108, 126, 108, 144, 144, 135, 144, 153, 180, 180, 171, 180, 198, 198, 189, 216, 243, 243, 234, 252, 225, 243, 261, 252, 297, 306, 333, 360, 324, 342, 342, 315, 360, 369, 378, 396, 387, 387, 414]