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.

A209819 Triangle of coefficients of polynomials u(n,x) jointly generated with A209820; see the Formula section.

Table of values

n a(n)
1 1
2 1
3 3
4 1
5 5
6 7
7 1
8 5
9 17
10 17
11 1
12 5
13 21
14 53
15 41
16 1
17 5
18 21
19 81
20 157
21 99
22 1
23 5
24 21
25 89
26 289
27 449
28 239
29 1
30 5
31 21
32 89
33 361
34 973
35 1253
36 577
37 1
38 5
39 21
40 89
41 377
42 1389
43 3133
44 3433
45 1393
46 1
47 5
48 21
49 89
50 377
51 1565
52 5085
53 9745
54 9273
55 3363
56 1
57 5
58 21
59 89
60 377
61 1597
62 6285

List of values

[1, 1, 3, 1, 5, 7, 1, 5, 17, 17, 1, 5, 21, 53, 41, 1, 5, 21, 81, 157, 99, 1, 5, 21, 89, 289, 449, 239, 1, 5, 21, 89, 361, 973, 1253, 577, 1, 5, 21, 89, 377, 1389, 3133, 3433, 1393, 1, 5, 21, 89, 377, 1565, 5085, 9745, 9273, 3363, 1, 5, 21, 89, 377, 1597, 6285]