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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.

A124442 a(n) = Product_{ceiling(n/2) <= k <= n, gcd(k,n)=1} k.

Table of values

n a(n)
1 1
2 1
3 2
4 3
5 12
6 5
7 120
8 35
9 280
10 63
11 30240
12 77
13 665280
14 1287
15 16016
16 19305
17 518918400
18 2431
19 17643225600
20 46189
21 14780480
22 1322685
23 28158588057600
24 96577
25 4317650168832
26 58503375
27 475931456000
28 75218625
29 3497296636753920000
30 215441
31 202843204931727360000

List of values

[1, 1, 2, 3, 12, 5, 120, 35, 280, 63, 30240, 77, 665280, 1287, 16016, 19305, 518918400, 2431, 17643225600, 46189, 14780480, 1322685, 28158588057600, 96577, 4317650168832, 58503375, 475931456000, 75218625, 3497296636753920000, 215441, 202843204931727360000]

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

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