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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.

A358611 a(n) = Sum_{k=0..floor(n/5)} (-1)^k * (n-5*k)!.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 24
5 119
6 719
7 5038
8 40314
9 362856
10 3628681
11 39916081
12 478996562
13 6226980486
14 87177928344
15 1307670739319
16 20922749971919
17 355686949099438
18 6402367478747514
19 121645013230903656
20 2432900700505900681
21 51090921248959468081
22 1124000372090658580562

List of values

[1, 1, 2, 6, 24, 119, 719, 5038, 40314, 362856, 3628681, 39916081, 478996562, 6226980486, 87177928344, 1307670739319, 20922749971919, 355686949099438, 6402367478747514, 121645013230903656, 2432900700505900681, 51090921248959468081, 1124000372090658580562]

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

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