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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.

A349002 The number of Lyndon words of size n from an alphabet of 4 letters and 1st, 2nd and 3rd letter of the alphabet with equal frequency in the words.

Table of values

n a(n)
0 1
1 1
2 0
3 2
4 6
5 12
6 34
7 120
8 354
9 1082
10 3636
11 12270
12 40708
13 139062
14 484866
15 1692268
16 5944470
17 21134808
18 75625330
19 271720146
20 982116648
21 3569558058
22 13025614962
23 47714385708
24 175470892468
25 647508620070
26 2396613522804
27 8896422981608
28 33114570409896
29 123566641829256

List of values

[1, 1, 0, 2, 6, 12, 34, 120, 354, 1082, 3636, 12270, 40708, 139062, 484866, 1692268, 5944470, 21134808, 75625330, 271720146, 982116648, 3569558058, 13025614962, 47714385708, 175470892468, 647508620070, 2396613522804, 8896422981608, 33114570409896, 123566641829256]

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

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