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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.

A333892 Number of permutations sigma of [n] such that i divides Product_{k=1..i} sigma(k) for 1 <= i <= n.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 14
5 36
6 320
7 1328
8 7872
9 51552
10 756480
11 5440752
12 68999136
13 584117952
14 9632932800
15 152699071104
16 1881048314880
17 21977611223040
18 343998708042240
19 4374197540536320
20 77078374650869760
21 1646804888482037760
22 45052372505959096320
23 727420047420178022400

List of values

[1, 1, 2, 4, 14, 36, 320, 1328, 7872, 51552, 756480, 5440752, 68999136, 584117952, 9632932800, 152699071104, 1881048314880, 21977611223040, 343998708042240, 4374197540536320, 77078374650869760, 1646804888482037760, 45052372505959096320, 727420047420178022400]

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

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