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.

A049774 Number of permutations of n elements not containing the consecutive pattern 123.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 17
5 70
6 349
7 2017
8 13358
9 99377
10 822041
11 7477162
12 74207209
13 797771521
14 9236662346
15 114579019469
16 1516103040833
17 21314681315998
18 317288088082405
19 4985505271920097
20 82459612672301846
21 1432064398910663705
22 26054771465540507273
23 495583804405888997218

List of values

[1, 1, 2, 5, 17, 70, 349, 2017, 13358, 99377, 822041, 7477162, 74207209, 797771521, 9236662346, 114579019469, 1516103040833, 21314681315998, 317288088082405, 4985505271920097, 82459612672301846, 1432064398910663705, 26054771465540507273, 495583804405888997218]

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

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