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.

A264772 Triangle T(n,k) = binomial(3*n - 2*k, 2*n - k), 0 <= k <= n.

Table of values

n a(n)
0 1
1 3
2 1
3 15
4 4
5 1
6 84
7 21
8 5
9 1
10 495
11 120
12 28
13 6
14 1
15 3003
16 715
17 165
18 36
19 7
20 1
21 18564
22 4368
23 1001
24 220
25 45
26 8
27 1
28 116280
29 27132
30 6188
31 1365
32 286
33 55
34 9
35 1
36 735471
37 170544
38 38760
39 8568
40 1820
41 364
42 66
43 10
44 1
45 4686825
46 1081575
47 245157
48 54264
49 11628
50 2380
51 455
52 78
53 11
54 1

List of values

[1, 3, 1, 15, 4, 1, 84, 21, 5, 1, 495, 120, 28, 6, 1, 3003, 715, 165, 36, 7, 1, 18564, 4368, 1001, 220, 45, 8, 1, 116280, 27132, 6188, 1365, 286, 55, 9, 1, 735471, 170544, 38760, 8568, 1820, 364, 66, 10, 1, 4686825, 1081575, 245157, 54264, 11628, 2380, 455, 78, 11, 1]