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.

A126325 Triangle read by rows: T(n,k) = binomial(2*n+1, n-k) (1 <= k <= n).

Table of values

n a(n)
1 1
2 5
3 1
4 21
5 7
6 1
7 84
8 36
9 9
10 1
11 330
12 165
13 55
14 11
15 1
16 1287
17 715
18 286
19 78
20 13
21 1
22 5005
23 3003
24 1365
25 455
26 105
27 15
28 1
29 19448
30 12376
31 6188
32 2380
33 680
34 136
35 17
36 1
37 75582
38 50388
39 27132
40 11628
41 3876
42 969
43 171
44 19
45 1
46 293930
47 203490
48 116280
49 54264
50 20349
51 5985
52 1330
53 210
54 21
55 1

List of values

[1, 5, 1, 21, 7, 1, 84, 36, 9, 1, 330, 165, 55, 11, 1, 1287, 715, 286, 78, 13, 1, 5005, 3003, 1365, 455, 105, 15, 1, 19448, 12376, 6188, 2380, 680, 136, 17, 1, 75582, 50388, 27132, 11628, 3876, 969, 171, 19, 1, 293930, 203490, 116280, 54264, 20349, 5985, 1330, 210, 21, 1]