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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.

A110903 Difference between the factorial of n and the double factorial of n.

Table of values

n a(n)
0 0
1 0
2 0
3 3
4 16
5 105
6 672
7 4935
8 39936
9 361935
10 3624960
11 39906405
12 478955520
13 6226885665
14 87177646080
15 1307672340975
16 20922779566080
17 355687393636575
18 6402373519933440
19 121645099754102925
20 2432902004460748800
21 51090942157960129425
22 1124000727695858073600

List of values

[0, 0, 0, 3, 16, 105, 672, 4935, 39936, 361935, 3624960, 39906405, 478955520, 6226885665, 87177646080, 1307672340975, 20922779566080, 355687393636575, 6402373519933440, 121645099754102925, 2432902004460748800, 51090942157960129425, 1124000727695858073600]

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

Content is available under The OEIS End-User License Agreement.