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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.

A099915 Expansion of g.f. (1+4*x)/((1-x)*(1-10*x)).

Table of values

n a(n)
0 1
1 15
2 155
3 1555
4 15555
5 155555
6 1555555
7 15555555
8 155555555
9 1555555555
10 15555555555
11 155555555555
12 1555555555555
13 15555555555555
14 155555555555555
15 1555555555555555
16 15555555555555555
17 155555555555555555
18 1555555555555555555
19 15555555555555555555
20 155555555555555555555

List of values

[1, 15, 155, 1555, 15555, 155555, 1555555, 15555555, 155555555, 1555555555, 15555555555, 155555555555, 1555555555555, 15555555555555, 155555555555555, 1555555555555555, 15555555555555555, 155555555555555555, 1555555555555555555, 15555555555555555555, 155555555555555555555]

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

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