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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.

A346199 a(n) is the number of permutations on [n] with at least one strong fixed point and no small descents.

Table of values

n a(n)
1 1
2 1
3 1
4 5
5 19
6 95
7 569
8 3957
9 31455
10 281435
11 2799981
12 30666153
13 366646995
14 4751669391
15 66348304849
16 992975080813
17 15856445382119
18 269096399032035
19 4836375742967861
20 91766664243841393
21 1833100630242606203
22 38452789552631651191
23 845116020421125048153

List of values

[1, 1, 1, 5, 19, 95, 569, 3957, 31455, 281435, 2799981, 30666153, 366646995, 4751669391, 66348304849, 992975080813, 15856445382119, 269096399032035, 4836375742967861, 91766664243841393, 1833100630242606203, 38452789552631651191, 845116020421125048153]

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

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