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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.

A290442 a(n) = Catalan(n-1)*Motzkin(n).

Table of values

n a(n)
1 1
2 2
3 8
4 45
5 294
6 2142
7 16764
8 138567
9 1194050
10 10638056
11 97383208
12 911829646
13 8702182020
14 84418698600
15 830606179680
16 8274230277615
17 83330214144930
18 847407871749780
19 8692682350690800
20 89868901315880610
21 935699342853054780
22 9805180025713805460
23 103353379063190310600
24 1095295964528435629050

List of values

[1, 2, 8, 45, 294, 2142, 16764, 138567, 1194050, 10638056, 97383208, 911829646, 8702182020, 84418698600, 830606179680, 8274230277615, 83330214144930, 847407871749780, 8692682350690800, 89868901315880610, 935699342853054780, 9805180025713805460, 103353379063190310600, 1095295964528435629050]

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

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