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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.

A061573 a(n) = (n!)^2*Sum_{k=1..n} 1/k!.

Table of values

n a(n)
1 1
2 6
3 60
4 984
5 24720
6 890640
7 43646400
8 2793409920
9 226266566400
10 22626660268800
11 2737825932441600
12 394246934750592000
13 66627731979077068800
14 13059035467986283776000
15 2938282980298221523968000
16 752200442956365632925696000
17 217385928014390023602954240000

List of values

[1, 6, 60, 984, 24720, 890640, 43646400, 2793409920, 226266566400, 22626660268800, 2737825932441600, 394246934750592000, 66627731979077068800, 13059035467986283776000, 2938282980298221523968000, 752200442956365632925696000, 217385928014390023602954240000]

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

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