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.

A209689 Triangle of coefficients of polynomials u(n,x) jointly generated with A209690; see the Formula section.

Table of values

n a(n)
1 1
2 0
3 2
4 0
5 2
6 3
7 0
8 1
9 6
10 4
11 0
12 1
13 4
14 13
15 5
16 0
17 1
18 3
19 13
20 24
21 6
22 0
23 1
24 3
25 9
26 35
27 40
28 7
29 0
30 1
31 3
32 8
33 28
34 81
35 62
36 8
37 0
38 1
39 3
40 8
41 22
42 82
43 167
44 91
45 9
46 0
47 1
48 3
49 8
50 21
51 64
52 217
53 315
54 128
55 10
56 0
57 1
58 3
59 8
60 21
61 56
62 188
63 519
64 554
65 174
66 11
67 0
68 1
69 3
70 8
71 21
72 55
73 155
74 529
75 1136
76 921

List of values

[1, 0, 2, 0, 2, 3, 0, 1, 6, 4, 0, 1, 4, 13, 5, 0, 1, 3, 13, 24, 6, 0, 1, 3, 9, 35, 40, 7, 0, 1, 3, 8, 28, 81, 62, 8, 0, 1, 3, 8, 22, 82, 167, 91, 9, 0, 1, 3, 8, 21, 64, 217, 315, 128, 10, 0, 1, 3, 8, 21, 56, 188, 519, 554, 174, 11, 0, 1, 3, 8, 21, 55, 155, 529, 1136, 921]