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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.

A304200 a(n) is the number of cyclic permutations with at most 2 ascents.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 6
5 18
6 58
7 186
8 570
9 1680
10 4878
11 14058
12 40200
13 114450
14 325290
15 923846
16 2624730
17 7465410
18 21261828
19 60647370
20 173288724
21 496014934
22 1422223506
23 4084793082
24 11751102060
25 33857989968
26 97697014590
27 282295318536
28 816759712080
29 2366027865810
30 6861964439314

List of values

[1, 1, 1, 2, 6, 18, 58, 186, 570, 1680, 4878, 14058, 40200, 114450, 325290, 923846, 2624730, 7465410, 21261828, 60647370, 173288724, 496014934, 1422223506, 4084793082, 11751102060, 33857989968, 97697014590, 282295318536, 816759712080, 2366027865810, 6861964439314]

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

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