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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.

A037487 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,2.

Table of values

n a(n)
1 1
2 12
3 121
4 1212
5 12121
6 121212
7 1212121
8 12121212
9 121212121
10 1212121212
11 12121212121
12 121212121212
13 1212121212121
14 12121212121212
15 121212121212121
16 1212121212121212
17 12121212121212121
18 121212121212121212
19 1212121212121212121
20 12121212121212121212

List of values

[1, 12, 121, 1212, 12121, 121212, 1212121, 12121212, 121212121, 1212121212, 12121212121, 121212121212, 1212121212121, 12121212121212, 121212121212121, 1212121212121212, 12121212121212121, 121212121212121212, 1212121212121212121, 12121212121212121212]

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

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