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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.

A052121 Triangle of coefficients of polynomials enumerating trees with n labeled nodes by inversions.

Table of values

n a(n)
1 1
2 1
3 2
4 1
5 6
6 6
7 3
8 1
9 24
10 36
11 30
12 20
13 10
14 4
15 1
16 120
17 240
18 270
19 240
20 180
21 120
22 70
23 35
24 15
25 5
26 1
27 720
28 1800
29 2520
30 2730
31 2520
32 2100
33 1610
34 1140
35 750
36 455
37 252
38 126
39 56
40 21
41 6
42 1
43 5040
44 15120
45 25200
46 31920
47 34230
48 32970
49 29400
50 24640
51 19600
52 14840
53 10696
54 7336

List of values

[1, 1, 2, 1, 6, 6, 3, 1, 24, 36, 30, 20, 10, 4, 1, 120, 240, 270, 240, 180, 120, 70, 35, 15, 5, 1, 720, 1800, 2520, 2730, 2520, 2100, 1610, 1140, 750, 455, 252, 126, 56, 21, 6, 1, 5040, 15120, 25200, 31920, 34230, 32970, 29400, 24640, 19600, 14840, 10696, 7336]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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