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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.

A185296 Triangle of connection constants between the falling factorials (x)(n)</span> and (<span class="maths">2*x)(n).

Table of values

n a(n)
0 1
1 0
2 2
3 0
4 2
5 4
6 0
7 0
8 12
9 8
10 0
11 0
12 12
13 48
14 16
15 0
16 0
17 0
18 120
19 160
20 32
21 0
22 0
23 0
24 120
25 720
26 480
27 64
28 0
29 0
30 0
31 0
32 1680
33 3360
34 1344
35 128
36 0
37 0
38 0
39 0
40 1680
41 13440
42 13440
43 3584
44 256
45 0
46 0
47 0
48 0
49 0
50 30240
51 80640
52 48384
53 9216
54 512

List of values

[1, 0, 2, 0, 2, 4, 0, 0, 12, 8, 0, 0, 12, 48, 16, 0, 0, 0, 120, 160, 32, 0, 0, 0, 120, 720, 480, 64, 0, 0, 0, 0, 1680, 3360, 1344, 128, 0, 0, 0, 0, 1680, 13440, 13440, 3584, 256, 0, 0, 0, 0, 0, 30240, 80640, 48384, 9216, 512]