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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.

A194718 Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting six doublets into the initially empty word.

Table of values

n a(n)
0 0
1 1
2 462
3 7941
4 48838
5 185193
6 530526
7 1265677
8 2654646
9 5060433
10 8960878
11 14964501
12 23826342
13 36463801
14 53972478
15 77642013
16 108971926
17 149687457
18 201755406
19 267399973
20 349118598
21 449697801
22 572229022
23 720124461
24 897132918
25 1107355633
26 1355262126
27 1645706037

List of values

[0, 1, 462, 7941, 48838, 185193, 530526, 1265677, 2654646, 5060433, 8960878, 14964501, 23826342, 36463801, 53972478, 77642013, 108971926, 149687457, 201755406, 267399973, 349118598, 449697801, 572229022, 720124461, 897132918, 1107355633, 1355262126, 1645706037]

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

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