cp's OEIS Frontend

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.

A097899 Number of permutations of [n] with no runs of length 1. (The permutation 3574162 has two runs of length 1: 357/4/16/2).

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 6
5 19
6 109
7 588
8 4033
9 29485
10 246042
11 2228203
12 22162249
13 237997032
14 2757055393
15 34191395785
16 452480427678
17 6360924613699
18 94691284984405
19 1487846074481172
20 24608991911033377
21 427379047337272213
22 7775688853750498386
23 147900024951747279643

List of values

[1, 0, 1, 1, 6, 19, 109, 588, 4033, 29485, 246042, 2228203, 22162249, 237997032, 2757055393, 34191395785, 452480427678, 6360924613699, 94691284984405, 1487846074481172, 24608991911033377, 427379047337272213, 7775688853750498386, 147900024951747279643]

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

Content is available under The OEIS End-User License Agreement.