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.

A246071 Number of endofunctions f on [2n] satisfying f^n(i) = i for all i in [n].

Table of values

n a(n)
0 1
1 2
2 50
3 1440
4 215760
5 11218000
6 8859219696
7 549669946784
8 797599992178688
9 195297824029876992
10 225830701916170080000
11 33538442785393084937728
12 478648537323384927696592896
13 26649057768458576467019134976
14 207869233649005397144301933676544

List of values

[1, 2, 50, 1440, 215760, 11218000, 8859219696, 549669946784, 797599992178688, 195297824029876992, 225830701916170080000, 33538442785393084937728, 478648537323384927696592896, 26649057768458576467019134976, 207869233649005397144301933676544]

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

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