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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.

A001142 a(n) = Product_{k=1..n} k^(2k - 1 - n).

Table of values

n a(n)
0 1
1 1
2 2
3 9
4 96
5 2500
6 162000
7 26471025
8 11014635520
9 11759522374656
10 32406091200000000
11 231627686043080250000
12 4311500661703860387840000
13 209706417310526095716965894400
14 26729809777664965932590782608648192

List of values

[1, 1, 2, 9, 96, 2500, 162000, 26471025, 11014635520, 11759522374656, 32406091200000000, 231627686043080250000, 4311500661703860387840000, 209706417310526095716965894400, 26729809777664965932590782608648192]

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

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