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.

A238761 Subtriangle of the generalized ballot numbers, T(n,k) = A238762(2*k-1,2*n-1), 1<=k<=n, read by rows.

Table of values

n a(n)
1 1
2 2
3 3
4 3
5 8
6 10
7 4
8 15
9 30
10 35
11 5
12 24
13 63
14 112
15 126
16 6
17 35
18 112
19 252
20 420
21 462
22 7
23 48
24 180
25 480
26 990
27 1584
28 1716
29 8
30 63
31 270
32 825
33 1980
34 3861
35 6006
36 6435
37 9
38 80
39 385
40 1320
41 3575
42 8008
43 15015
44 22880
45 24310
46 10
47 99
48 528
49 2002
50 6006
51 15015
52 32032
53 58344
54 87516
55 92378

List of values

[1, 2, 3, 3, 8, 10, 4, 15, 30, 35, 5, 24, 63, 112, 126, 6, 35, 112, 252, 420, 462, 7, 48, 180, 480, 990, 1584, 1716, 8, 63, 270, 825, 1980, 3861, 6006, 6435, 9, 80, 385, 1320, 3575, 8008, 15015, 22880, 24310, 10, 99, 528, 2002, 6006, 15015, 32032, 58344, 87516, 92378]