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.

A222638 Product, for k <= n, of the squarefree parts of the total number of arrangements of a set with k elements.

Table of values

n a(n)
0 1
1 2
2 10
3 10
4 650
5 211900
6 414688300
7 56812297100
8 6226684574457100
9 6142063931090228011000
10 60585938964731049213533111000
11 1643471023248326636197980531190858000
12 12662130715971848810220521992462621415290000
13 214329322370515670487612822767624011121300533960940000

List of values

[1, 2, 10, 10, 650, 211900, 414688300, 56812297100, 6226684574457100, 6142063931090228011000, 60585938964731049213533111000, 1643471023248326636197980531190858000, 12662130715971848810220521992462621415290000, 214329322370515670487612822767624011121300533960940000]

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

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