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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.

A361877 a(n) = binomial(2*n, n) * binomial(2*n - 1, n).

Table of values

n a(n)
0 1
1 2
2 18
3 200
4 2450
5 31752
6 426888
7 5889312
8 82818450
9 1181952200
10 17067389768
11 248817153312
12 3656229836168
13 54086240180000
14 804670797780000
15 12030722505475200
16 180648817621276050
17 2722858995011344200
18 41179040356653045000
19 624643836545795220000
20 9500832753861545296200

List of values

[1, 2, 18, 200, 2450, 31752, 426888, 5889312, 82818450, 1181952200, 17067389768, 248817153312, 3656229836168, 54086240180000, 804670797780000, 12030722505475200, 180648817621276050, 2722858995011344200, 41179040356653045000, 624643836545795220000, 9500832753861545296200]

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

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