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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.

A007696 Quartic (or 4-fold) factorial numbers: a(n) = Product_{k = 0..n-1} (4*k + 1).

Table of values

n a(n)
0 1
1 1
2 5
3 45
4 585
5 9945
6 208845
7 5221125
8 151412625
9 4996616625
10 184874815125
11 7579867420125
12 341094033905625
13 16713607661375625
14 885821206052908125
15 50491808745015763125
16 3080000333445961550625
17 200200021673987500790625
18 13813801495505137554553125

List of values

[1, 1, 5, 45, 585, 9945, 208845, 5221125, 151412625, 4996616625, 184874815125, 7579867420125, 341094033905625, 16713607661375625, 885821206052908125, 50491808745015763125, 3080000333445961550625, 200200021673987500790625, 13813801495505137554553125]

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

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