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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.

A137746 Number of different strings of length n obtained from "abcdef" by iteratively duplicating any substring.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 1
7 6
8 26
9 100
10 360
11 1246
12 4217
13 14102
14 46861
15 155212
16 513336
17 1697264
18 5614670
19 18594258
20 61671770
21 204907302
22 682110940
23 2275141754
24 7603690251
25 25462152854
26 85428752530
27 287163766530
28 967046587261
29 3262356284310
30 11024401089607
31 37315689561280
32 126506891234231

List of values

[0, 0, 0, 0, 0, 0, 1, 6, 26, 100, 360, 1246, 4217, 14102, 46861, 155212, 513336, 1697264, 5614670, 18594258, 61671770, 204907302, 682110940, 2275141754, 7603690251, 25462152854, 85428752530, 287163766530, 967046587261, 3262356284310, 11024401089607, 37315689561280, 126506891234231]

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

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