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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.

A357191 a(n) = n! * Sum_{k=0..floor(n/2)} k^n/k!.

Table of values

n a(n)
0 1
1 0
2 2
3 6
4 216
5 2040
6 111240
7 2164680
8 159391680
9 5247305280
10 491431600800
11 24437592194400
12 2800955712804480
13 195393943295591040
14 26699221909806526080
15 2479967110139382864000
16 396503602252401676032000
17 47167550656581451928832000

List of values

[1, 0, 2, 6, 216, 2040, 111240, 2164680, 159391680, 5247305280, 491431600800, 24437592194400, 2800955712804480, 195393943295591040, 26699221909806526080, 2479967110139382864000, 396503602252401676032000, 47167550656581451928832000]

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

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