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.

A006472 a(n) = n!*(n-1)!/2^(n-1).

Table of values

n a(n)
1 1
2 1
3 3
4 18
5 180
6 2700
7 56700
8 1587600
9 57153600
10 2571912000
11 141455160000
12 9336040560000
13 728211163680000
14 66267215894880000
15 6958057668962400000
16 834966920275488000000
17 113555501157466368000000
18 17373991677092354304000000
19 2970952576782792585984000000

List of values

[1, 1, 3, 18, 180, 2700, 56700, 1587600, 57153600, 2571912000, 141455160000, 9336040560000, 728211163680000, 66267215894880000, 6958057668962400000, 834966920275488000000, 113555501157466368000000, 17373991677092354304000000, 2970952576782792585984000000]

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

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