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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.

A346661 Number of cyclic patterns of length n that avoid the vincular pattern 23-4-1.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 15
5 50
6 180
7 690
8 2792
9 11857
10 52633
11 243455
12 1170525
13 5837934
14 30151474
15 161021581
16 888001485
17 5051014786
18 29600662480
19 178541105770
20 1107321666920
21 7055339825171
22 46142654894331
23 309513540865544
24 2127744119042216
25 14979904453920111
26 107932371558460341
27 795363217306369817
28 5990768203554158167
29 46094392105916344968
30 362092868720288824992

List of values

[1, 1, 2, 5, 15, 50, 180, 690, 2792, 11857, 52633, 243455, 1170525, 5837934, 30151474, 161021581, 888001485, 5051014786, 29600662480, 178541105770, 1107321666920, 7055339825171, 46142654894331, 309513540865544, 2127744119042216, 14979904453920111, 107932371558460341, 795363217306369817, 5990768203554158167, 46094392105916344968, 362092868720288824992]

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

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