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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.

A370383 Number of permutations of [n] having no substring [k,k+1,k+2,k+3,k+4].

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 24
5 119
6 717
7 5026
8 40242
9 362376
10 3625081
11 39885851
12 478714416
13 6224078292
14 87145277160
15 1307271652917
16 20917481850667
17 355612235468396
18 6401234296266540
19 121626707638142280
20 2432586885636105251
21 51085230669413519349
22 1123891538655073251190

List of values

[1, 1, 2, 6, 24, 119, 717, 5026, 40242, 362376, 3625081, 39885851, 478714416, 6224078292, 87145277160, 1307271652917, 20917481850667, 355612235468396, 6401234296266540, 121626707638142280, 2432586885636105251, 51085230669413519349, 1123891538655073251190]

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

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