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.

A131928 a(n) = phi(binomial(2*n,n)*n).

Table of values

n a(n)
0 0
1 1
2 4
3 16
4 96
5 288
6 1440
7 5760
8 23040
9 92160
10 552960
11 1658880
12 7299072
13 36495360
14 109486080
15 510935040
16 2043740160
17 7664025600
18 28740096000
19 114960384000
20 459841536000
21 1839366144000
22 8583708672000
23 38626689024000

List of values

[0, 1, 4, 16, 96, 288, 1440, 5760, 23040, 92160, 552960, 1658880, 7299072, 36495360, 109486080, 510935040, 2043740160, 7664025600, 28740096000, 114960384000, 459841536000, 1839366144000, 8583708672000, 38626689024000]

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

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