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.

A323291 Denominator of the sum of inverse products of cycle sizes in all permutations of [n].

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 12
5 20
6 360
7 2520
8 1680
9 15120
10 151200
11 554400
12 9979200
13 129729600
14 605404800
15 27243216000
16 54486432000
17 308756448000
18 5557616064000
19 8122669632000
20 351982350720000
21 22174888095360000
22 25676186215680000
23 3740164458750720000
24 67322960257512960000

List of values

[1, 1, 2, 6, 12, 20, 360, 2520, 1680, 15120, 151200, 554400, 9979200, 129729600, 605404800, 27243216000, 54486432000, 308756448000, 5557616064000, 8122669632000, 351982350720000, 22174888095360000, 25676186215680000, 3740164458750720000, 67322960257512960000]

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

Content is available under The OEIS End-User License Agreement.