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.

A001813 Quadruple factorial numbers: a(n) = (2n)!/n!.

Table of values

n a(n)
0 1
1 2
2 12
3 120
4 1680
5 30240
6 665280
7 17297280
8 518918400
9 17643225600
10 670442572800
11 28158588057600
12 1295295050649600
13 64764752532480000
14 3497296636753920000
15 202843204931727360000
16 12576278705767096320000
17 830034394580628357120000
18 58102407620643984998400000

List of values

[1, 2, 12, 120, 1680, 30240, 665280, 17297280, 518918400, 17643225600, 670442572800, 28158588057600, 1295295050649600, 64764752532480000, 3497296636753920000, 202843204931727360000, 12576278705767096320000, 830034394580628357120000, 58102407620643984998400000]

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

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