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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.

A370384 Number of permutations of [n] having no substring [k,k+1,k+2,k+3,k+4,k+5].

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 719
7 5037
8 40306
9 362802
10 3628296
11 39913080
12 478970641
13 6226733531
14 87175347936
15 1307641346772
16 20922387099240
17 355682119243320
18 6402298503373917
19 121643960874649867
20 2432883613692550316
21 51090627024035616300
22 1123995015882951892680

List of values

[1, 1, 2, 6, 24, 120, 719, 5037, 40306, 362802, 3628296, 39913080, 478970641, 6226733531, 87175347936, 1307641346772, 20922387099240, 355682119243320, 6402298503373917, 121643960874649867, 2432883613692550316, 51090627024035616300, 1123995015882951892680]

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

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