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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.

A348597 a(n) = n! * Sum_{k=0..floor(n/3)} (-1)^k / (3*k)!.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 20
5 100
6 601
7 4207
8 33656
9 302903
10 3029030
11 33319330
12 399831961
13 5197815493
14 72769416902
15 1091541253529
16 17464660056464
17 296899220959888
18 5344185977277985
19 101539533568281715
20 2030790671365634300
21 42646604098678320299
22 938225290170923046578

List of values

[1, 1, 2, 5, 20, 100, 601, 4207, 33656, 302903, 3029030, 33319330, 399831961, 5197815493, 72769416902, 1091541253529, 17464660056464, 296899220959888, 5344185977277985, 101539533568281715, 2030790671365634300, 42646604098678320299, 938225290170923046578]

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

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