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.

A280889 Number of set partitions of [2n] into exactly n blocks where sizes of distinct blocks are coprime.

Table of values

n a(n)
0 1
1 1
2 4
3 75
4 56
5 6930
6 28512
7 2849847
8 972400
9 693870606
10 99936200
11 63488350926
12 475814969280
13 166184959669300
14 497980728000
15 78877488833249175
16 1489333512849120
17 1116126129558913110
18 1597083864660900000
19 4467282986266589095530
20 107279471180408841600

List of values

[1, 1, 4, 75, 56, 6930, 28512, 2849847, 972400, 693870606, 99936200, 63488350926, 475814969280, 166184959669300, 497980728000, 78877488833249175, 1489333512849120, 1116126129558913110, 1597083864660900000, 4467282986266589095530, 107279471180408841600]

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

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