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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.

A073187 Triangle of C(n+1,k)*C(2*n-3*k,n-3*k)/(n+1) by rows.

Table of values

n a(n)
1 1
2 1
3 2
4 5
5 1
6 14
7 5
8 42
9 21
10 132
11 84
12 3
13 429
14 330
15 28
16 1430
17 1287
18 180
19 4862
20 5005
21 990
22 12
23 16796
24 19448
25 5005
26 165
27 58786
28 75582
29 24024
30 1430
31 208012
32 293930
33 111384
34 10010
35 55
36 742900
37 1144066
38 503880
39 61880
40 1001
41 2674440
42 4457400
43 2238390

List of values

[1, 1, 2, 5, 1, 14, 5, 42, 21, 132, 84, 3, 429, 330, 28, 1430, 1287, 180, 4862, 5005, 990, 12, 16796, 19448, 5005, 165, 58786, 75582, 24024, 1430, 208012, 293930, 111384, 10010, 55, 742900, 1144066, 503880, 61880, 1001, 2674440, 4457400, 2238390]

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

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