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.

A378240 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(n,r) * binomial(3*n+3*r+k,n)/(3*n+3*r+k) for k > 0.

Table of values

n a(n)
0 1
1 1
2 0
3 1
4 2
5 0
6 1
7 4
8 18
9 0
10 1
11 6
12 40
13 234
14 0
15 1
16 8
17 66
18 540
19 3570
20 0
21 1
22 10
23 96
24 926
25 8400
26 59586
27 0
28 1
29 12
30 130
31 1400
32 14706
33 141876
34 1053570
35 0
36 1
37 14
38 168
39 1970
40 22720
41 251622
42 2528760
43 19392490
44 0
45 1
46 16
47 210
48 2644
49 32690
50 394152
51 4524786
52 46815116
53 367677090
54 0

List of values

[1, 1, 0, 1, 2, 0, 1, 4, 18, 0, 1, 6, 40, 234, 0, 1, 8, 66, 540, 3570, 0, 1, 10, 96, 926, 8400, 59586, 0, 1, 12, 130, 1400, 14706, 141876, 1053570, 0, 1, 14, 168, 1970, 22720, 251622, 2528760, 19392490, 0, 1, 16, 210, 2644, 32690, 394152, 4524786, 46815116, 367677090, 0]