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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.

A273001 Number of permutations of [n] whose cycle lengths are Fibonacci numbers.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 18
5 90
6 420
7 2220
8 19020
9 130860
10 1096920
11 9862920
12 83843640
13 1411202520
14 16144792560
15 203091829200
16 2989264122000
17 37012939750800
18 597962683188000
19 8681244913692000
20 126467701221607200
21 5006833609034743200
22 95602098255580238400

List of values

[1, 1, 2, 6, 18, 90, 420, 2220, 19020, 130860, 1096920, 9862920, 83843640, 1411202520, 16144792560, 203091829200, 2989264122000, 37012939750800, 597962683188000, 8681244913692000, 126467701221607200, 5006833609034743200, 95602098255580238400]

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

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