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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.

A358608 a(n) = Sum_{k=0..floor(n/3)} (-1)^k * (n-3*k)!.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 23
5 118
6 715
7 5017
8 40202
9 362165
10 3623783
11 39876598
12 478639435
13 6223397017
14 87138414602
15 1307195728565
16 20916566490983
17 355600289681398
18 6401066509999435
19 121624183842341017
20 2432546407886958602
21 51084541105199440565
22 1123879103593765338983

List of values

[1, 1, 2, 5, 23, 118, 715, 5017, 40202, 362165, 3623783, 39876598, 478639435, 6223397017, 87138414602, 1307195728565, 20916566490983, 355600289681398, 6401066509999435, 121624183842341017, 2432546407886958602, 51084541105199440565, 1123879103593765338983]

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

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