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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.

A368765 a(n) = n! * (1 + Sum_{k=0..n} (-1)^k * k / k!).

Table of values

n a(n)
0 1
1 0
2 2
3 3
4 16
5 75
6 456
7 3185
8 25488
9 229383
10 2293840
11 25232229
12 302786760
13 3936227867
14 55107190152
15 826607852265
16 13225725636256
17 224837335816335
18 4047072044694048
19 76894368849186893
20 1537887376983737880
21 32295634916658495459
22 710503968166486900120
23 16341591267829198702737

List of values

[1, 0, 2, 3, 16, 75, 456, 3185, 25488, 229383, 2293840, 25232229, 302786760, 3936227867, 55107190152, 826607852265, 13225725636256, 224837335816335, 4047072044694048, 76894368849186893, 1537887376983737880, 32295634916658495459, 710503968166486900120, 16341591267829198702737]

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

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