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.

A208905 Triangle of coefficients of polynomials u(n,x) jointly generated with A208906; see the Formula section.

Table of values

n a(n)
1 1
2 1
3 2
4 1
5 6
6 2
7 1
8 12
9 6
10 4
11 1
12 20
13 12
14 20
15 4
16 1
17 30
18 20
19 60
20 20
21 8
22 1
23 42
24 30
25 140
26 60
27 56
28 8
29 1
30 56
31 42
32 280
33 140
34 224
35 56
36 16
37 1
38 72
39 56
40 504
41 280
42 672
43 224
44 144
45 16
46 1
47 90
48 72
49 840
50 504
51 1680
52 672
53 720
54 144
55 32
56 1
57 110
58 90
59 1320
60 840
61 3696
62 1680
63 2640
64 720

List of values

[1, 1, 2, 1, 6, 2, 1, 12, 6, 4, 1, 20, 12, 20, 4, 1, 30, 20, 60, 20, 8, 1, 42, 30, 140, 60, 56, 8, 1, 56, 42, 280, 140, 224, 56, 16, 1, 72, 56, 504, 280, 672, 224, 144, 16, 1, 90, 72, 840, 504, 1680, 672, 720, 144, 32, 1, 110, 90, 1320, 840, 3696, 1680, 2640, 720]