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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.

A189230 Complementary Catalan triangle read by rows.

Table of values

n a(n)
0 0
1 1
2 0
3 0
4 2
5 0
6 3
7 0
8 3
9 0
10 0
11 8
12 0
13 4
14 0
15 10
16 0
17 15
18 0
19 5
20 0
21 0
22 30
23 0
24 24
25 0
26 6
27 0
28 35
29 0
30 63
31 0
32 35
33 0
34 7
35 0
36 0
37 112
38 0
39 112
40 0
41 48
42 0
43 8
44 0
45 126
46 0
47 252
48 0
49 180
50 0
51 63
52 0
53 9
54 0
55 0
56 420
57 0
58 480
59 0
60 270
61 0
62 80
63 0
64 10
65 0
66 462
67 0
68 990
69 0
70 825
71 0
72 385
73 0
74 99
75 0
76 11
77 0

List of values

[0, 1, 0, 0, 2, 0, 3, 0, 3, 0, 0, 8, 0, 4, 0, 10, 0, 15, 0, 5, 0, 0, 30, 0, 24, 0, 6, 0, 35, 0, 63, 0, 35, 0, 7, 0, 0, 112, 0, 112, 0, 48, 0, 8, 0, 126, 0, 252, 0, 180, 0, 63, 0, 9, 0, 0, 420, 0, 480, 0, 270, 0, 80, 0, 10, 0, 462, 0, 990, 0, 825, 0, 385, 0, 99, 0, 11, 0]

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