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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.

A172613 a(n) = (9n)!/(9!^n).

Table of values

n a(n)
0 1
1 1
2 48620
3 227873431500
4 21452752266265320000
5 19010638202652030712978200000
6 101097362223624462291180422369532000000
7 2392741010223442438553822446842770682716580000000
8 203653377853981828616656775313699668953042169048889600000000

List of values

[1, 1, 48620, 227873431500, 21452752266265320000, 19010638202652030712978200000, 101097362223624462291180422369532000000, 2392741010223442438553822446842770682716580000000, 203653377853981828616656775313699668953042169048889600000000]

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

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