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.

A124846 Triangle read by rows: T(n,k) = (2 - (-1)^k)*binomial(n,k) (0 <= k <= n).

Table of values

n a(n)
0 1
1 1
2 3
3 1
4 6
5 1
6 1
7 9
8 3
9 3
10 1
11 12
12 6
13 12
14 1
15 1
16 15
17 10
18 30
19 5
20 3
21 1
22 18
23 15
24 60
25 15
26 18
27 1
28 1
29 21
30 21
31 105
32 35
33 63
34 7
35 3
36 1
37 24
38 28
39 168
40 70
41 168
42 28
43 24
44 1
45 1
46 27
47 36
48 252
49 126
50 378
51 84
52 108
53 9
54 3
55 1
56 30
57 45
58 360
59 210
60 756
61 210
62 360
63 45
64 30
65 1
66 1
67 33
68 55
69 495
70 330
71 1386
72 462
73 990

List of values

[1, 1, 3, 1, 6, 1, 1, 9, 3, 3, 1, 12, 6, 12, 1, 1, 15, 10, 30, 5, 3, 1, 18, 15, 60, 15, 18, 1, 1, 21, 21, 105, 35, 63, 7, 3, 1, 24, 28, 168, 70, 168, 28, 24, 1, 1, 27, 36, 252, 126, 378, 84, 108, 9, 3, 1, 30, 45, 360, 210, 756, 210, 360, 45, 30, 1, 1, 33, 55, 495, 330, 1386, 462, 990]