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.

A132812 Triangle read by rows, n>=1, 1<=k<=n, T(n,k) = k*binomial(n,k)^2/(n-k+1).

Table of values

n a(n)
1 1
2 2
3 2
4 3
5 9
6 3
7 4
8 24
9 24
10 4
11 5
12 50
13 100
14 50
15 5
16 6
17 90
18 300
19 300
20 90
21 6
22 7
23 147
24 735
25 1225
26 735
27 147
28 7
29 8
30 224
31 1568
32 3920
33 3920
34 1568
35 224
36 8
37 9
38 324
39 3024
40 10584
41 15876
42 10584
43 3024
44 324
45 9
46 10
47 450
48 5400
49 25200
50 52920
51 52920
52 25200
53 5400
54 450
55 10

List of values

[1, 2, 2, 3, 9, 3, 4, 24, 24, 4, 5, 50, 100, 50, 5, 6, 90, 300, 300, 90, 6, 7, 147, 735, 1225, 735, 147, 7, 8, 224, 1568, 3920, 3920, 1568, 224, 8, 9, 324, 3024, 10584, 15876, 10584, 3024, 324, 9, 10, 450, 5400, 25200, 52920, 52920, 25200, 5400, 450, 10]