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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.

A056499 Number of primitive (period n) periodic palindromes using exactly three different symbols.

Table of values

n a(n)
1 0
2 0
3 0
4 3
5 6
6 21
7 36
8 90
9 150
10 339
11 540
12 1149
13 1806
14 3765
15 5790
16 11880
17 18150
18 36894
19 55980
20 113145
21 170970
22 344541
23 519156
24 1043190
25 1569744
26 3149979
27 4733670
28 9488409
29 14250606
30 28544205
31 42850116
32 85786560
33 128746410
34 257672355
35 386634018
36 773623116
37 1160688606

List of values

[0, 0, 0, 3, 6, 21, 36, 90, 150, 339, 540, 1149, 1806, 3765, 5790, 11880, 18150, 36894, 55980, 113145, 170970, 344541, 519156, 1043190, 1569744, 3149979, 4733670, 9488409, 14250606, 28544205, 42850116, 85786560, 128746410, 257672355, 386634018, 773623116, 1160688606]

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

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