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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.

A085880 Triangle T(n,k) read by rows: multiply row n of Pascal's triangle (A007318) by the n-th Catalan number (A000108).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 4
5 2
6 5
7 15
8 15
9 5
10 14
11 56
12 84
13 56
14 14
15 42
16 210
17 420
18 420
19 210
20 42
21 132
22 792
23 1980
24 2640
25 1980
26 792
27 132
28 429
29 3003
30 9009
31 15015
32 15015
33 9009
34 3003
35 429
36 1430
37 11440
38 40040
39 80080
40 100100
41 80080
42 40040
43 11440
44 1430
45 4862
46 43758
47 175032
48 408408
49 612612
50 612612
51 408408
52 175032
53 43758
54 4862

List of values

[1, 1, 1, 2, 4, 2, 5, 15, 15, 5, 14, 56, 84, 56, 14, 42, 210, 420, 420, 210, 42, 132, 792, 1980, 2640, 1980, 792, 132, 429, 3003, 9009, 15015, 15015, 9009, 3003, 429, 1430, 11440, 40040, 80080, 100100, 80080, 40040, 11440, 1430, 4862, 43758, 175032, 408408, 612612, 612612, 408408, 175032, 43758, 4862]

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

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