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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.

A094623 Expansion of g.f. x*(1+10*x)/((1-x)*(1-10*x^2)).

Table of values

n a(n)
0 0
1 1
2 11
3 21
4 121
5 221
6 1221
7 2221
8 12221
9 22221
10 122221
11 222221
12 1222221
13 2222221
14 12222221
15 22222221
16 122222221
17 222222221
18 1222222221
19 2222222221
20 12222222221
21 22222222221
22 122222222221
23 222222222221
24 1222222222221

List of values

[0, 1, 11, 21, 121, 221, 1221, 2221, 12221, 22221, 122221, 222221, 1222221, 2222221, 12222221, 22222221, 122222221, 222222221, 1222222221, 2222222221, 12222222221, 22222222221, 122222222221, 222222222221, 1222222222221]

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

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