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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.

A224479 a(n) = Product_{k=1..n} Product_{i=1..k-1} gcd(k,i).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 2
6 24
7 24
8 384
9 3456
10 276480
11 276480
12 955514880
13 955514880
14 428070666240
15 866843099136000
16 1775294667030528000
17 1775294667030528000
18 331312591939905257472000
19 331312591939905257472000
20 339264094146462983651328000000

List of values

[1, 1, 1, 1, 2, 2, 24, 24, 384, 3456, 276480, 276480, 955514880, 955514880, 428070666240, 866843099136000, 1775294667030528000, 1775294667030528000, 331312591939905257472000, 331312591939905257472000, 339264094146462983651328000000]

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

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