cp's OEIS Frontend

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.

A063902 a(n+1) = sum{j = 0,...n}[C(2n,2j)a(j)a(n-j)] with a(0) = 1.

Table of values

n a(n)
0 1
1 1
2 2
3 10
4 80
5 1000
6 17600
7 418000
8 12848000
9 496672000
10 23576960000
11 1348404640000
12 91442700800000
13 7255463564800000
14 665885747225600000
15 69994087116448000000
16 8354181454767104000000
17 1123646013779238400000000
18 169165728883243642880000000

List of values

[1, 1, 2, 10, 80, 1000, 17600, 418000, 12848000, 496672000, 23576960000, 1348404640000, 91442700800000, 7255463564800000, 665885747225600000, 69994087116448000000, 8354181454767104000000, 1123646013779238400000000, 169165728883243642880000000]

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

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