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.

A245959 Number of endofunctions f on [2n] satisfying f^3(i) = i for all i in [n].

Table of values

n a(n)
0 1
1 2
2 36
3 1440
4 84624
5 7675200
6 962250624
7 151851992544
8 30421572307200
9 7430515709340672
10 2142144445293849600
11 727442024443449689088
12 285148327160858698469376
13 127152465871110917459189760
14 64226006581334387301393186816
15 36322574197169989225245335040000

List of values

[1, 2, 36, 1440, 84624, 7675200, 962250624, 151851992544, 30421572307200, 7430515709340672, 2142144445293849600, 727442024443449689088, 285148327160858698469376, 127152465871110917459189760, 64226006581334387301393186816, 36322574197169989225245335040000]

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

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