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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.

A368766 a(n) = n! * (1 + Sum_{k=0..n} (-1)^k * binomial(k+1,2) / k!).

Table of values

n a(n)
0 1
1 0
2 3
3 3
4 22
5 95
6 591
7 4109
8 32908
9 296127
10 2961325
11 32574509
12 390894186
13 5081624327
14 71142740683
15 1067141110125
16 17074257762136
17 290262381956159
18 5224722875211033
19 99269734629009437
20 1985394692580188950
21 41693288544183967719
22 917252347972047290071

List of values

[1, 0, 3, 3, 22, 95, 591, 4109, 32908, 296127, 2961325, 32574509, 390894186, 5081624327, 71142740683, 1067141110125, 17074257762136, 290262381956159, 5224722875211033, 99269734629009437, 1985394692580188950, 41693288544183967719, 917252347972047290071]

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

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