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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.

A291547 a(n) = ((2*n-1)!!)^n.

Table of values

n a(n)
1 1
2 9
3 3375
4 121550625
5 753631499840625
6 1261673443947253805015625
7 822952789790387281855874669859609375
8 285018362247755338974104595257347347998199462890625
9 68512882179510153729154120317673085873841328059500855014801025390625

List of values

[1, 9, 3375, 121550625, 753631499840625, 1261673443947253805015625, 822952789790387281855874669859609375, 285018362247755338974104595257347347998199462890625, 68512882179510153729154120317673085873841328059500855014801025390625]

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

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