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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.

A128417 Number triangle T(n,k) = 2^(n-k)*C(2*n,n-k).

Table of values

n a(n)
0 1
1 4
2 1
3 24
4 8
5 1
6 160
7 60
8 12
9 1
10 1120
11 448
12 112
13 16
14 1
15 8064
16 3360
17 960
18 180
19 20
20 1
21 59136
22 25344
23 7920
24 1760
25 264
26 24
27 1
28 439296
29 192192
30 64064
31 16016
32 2912
33 364
34 28
35 1
36 3294720
37 1464320
38 512512
39 139776
40 29120
41 4480
42 480
43 32
44 1

List of values

[1, 4, 1, 24, 8, 1, 160, 60, 12, 1, 1120, 448, 112, 16, 1, 8064, 3360, 960, 180, 20, 1, 59136, 25344, 7920, 1760, 264, 24, 1, 439296, 192192, 64064, 16016, 2912, 364, 28, 1, 3294720, 1464320, 512512, 139776, 29120, 4480, 480, 32, 1]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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