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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.

A295496 a(n) = phi(6^n-1)/n, where phi is Euler's totient function (A000010).

Table of values

n a(n)
1 4
2 12
3 56
4 216
5 1240
6 5040
7 31992
8 139968
9 828576
10 3720000
11 25238048
12 104509440
13 803499840
14 3687014016
15 24373440000
16 110630707200
17 790546192128
18 3463116249600
19 25522921047520
20 108957312000000
21 816244048599840
22 3924124012353600
23 26682733370563200

List of values

[4, 12, 56, 216, 1240, 5040, 31992, 139968, 828576, 3720000, 25238048, 104509440, 803499840, 3687014016, 24373440000, 110630707200, 790546192128, 3463116249600, 25522921047520, 108957312000000, 816244048599840, 3924124012353600, 26682733370563200]

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

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