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.

A211880 Number of permutations of n elements with no fixed points and largest cycle of length 3.

Table of values

n a(n)
0 0
1 0
2 0
3 2
4 0
5 20
6 40
7 210
8 1120
9 4760
10 25200
11 157850
12 800800
13 5345340
14 35035000
15 222472250
16 1648046400
17 12000388400
18 88529240800
19 720929459250
20 5786188408000
21 48072795270500
22 424300329453000
23 3731123025279650
24 34083741984292000
25 323768324084205000

List of values

[0, 0, 0, 2, 0, 20, 40, 210, 1120, 4760, 25200, 157850, 800800, 5345340, 35035000, 222472250, 1648046400, 12000388400, 88529240800, 720929459250, 5786188408000, 48072795270500, 424300329453000, 3731123025279650, 34083741984292000, 323768324084205000]

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

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