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.

A378291 Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,0) = 0^n and T(n,k) = k * Sum_{r=0..n} binomial(3*n-2*r+k,r) * binomial(r,n-r)/(3*n-2*r+k) for k > 0.

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 1
5 0
6 1
7 2
8 2
9 0
10 1
11 3
12 5
13 6
14 0
15 1
16 4
17 9
18 16
19 20
20 0
21 1
22 5
23 14
24 31
25 56
26 72
27 0
28 1
29 6
30 20
31 52
32 114
33 208
34 273
35 0
36 1
37 7
38 27
39 80
40 201
41 438
42 806
43 1073
44 0
45 1
46 8
47 35
48 116
49 325
50 800
51 1739
52 3220
53 4333
54 0
55 1
56 9
57 44
58 161
59 495
60 1341
61 3260
62 7077
63 13168
64 17869
65 0

List of values

[1, 1, 0, 1, 1, 0, 1, 2, 2, 0, 1, 3, 5, 6, 0, 1, 4, 9, 16, 20, 0, 1, 5, 14, 31, 56, 72, 0, 1, 6, 20, 52, 114, 208, 273, 0, 1, 7, 27, 80, 201, 438, 806, 1073, 0, 1, 8, 35, 116, 325, 800, 1739, 3220, 4333, 0, 1, 9, 44, 161, 495, 1341, 3260, 7077, 13168, 17869, 0]