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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.

A354756 a(n) is the number of permutations p of [n] such that lcm(i, p(i)) <= n for all i in [n].

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 8
5 10
6 56
7 64
8 192
9 332
10 1184
11 1264
12 12192
13 12872
14 37568
15 100836
16 311760
17 322320
18 2338368
19 2408848
20 14433408
21 32058912
22 76931008
23 78528704
24 919469408
25 1158792224
26 2689828672
27 4675217824
28 21679173184
29 21984820864
30 381078324992
31 386159441600

List of values

[1, 1, 2, 3, 8, 10, 56, 64, 192, 332, 1184, 1264, 12192, 12872, 37568, 100836, 311760, 322320, 2338368, 2408848, 14433408, 32058912, 76931008, 78528704, 919469408, 1158792224, 2689828672, 4675217824, 21679173184, 21984820864, 381078324992, 386159441600]

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

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