cp's OEIS Frontend

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.

A074143 a(1) = 1; a(n) = n * Sum_{k=1..n-1} a(k).

Table of values

n a(n)
1 1
2 2
3 9
4 48
5 300
6 2160
7 17640
8 161280
9 1632960
10 18144000
11 219542400
12 2874009600
13 40475635200
14 610248038400
15 9807557760000
16 167382319104000
17 3023343138816000
18 57621363351552000
19 1155628453883904000
20 24329020081766400000
21 536454892802949120000

List of values

[1, 2, 9, 48, 300, 2160, 17640, 161280, 1632960, 18144000, 219542400, 2874009600, 40475635200, 610248038400, 9807557760000, 167382319104000, 3023343138816000, 57621363351552000, 1155628453883904000, 24329020081766400000, 536454892802949120000]

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

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