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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.

A383429 a(1)=1, and for n>1, a(n) = a(n-1) concatenated with the length of the decimal representation of a(n-1).

Table of values

n a(n)
1 1
2 11
3 112
4 1123
5 11234
6 112345
7 1123456
8 11234567
9 112345678
10 1123456789
11 112345678910
12 11234567891012
13 1123456789101214
14 112345678910121416
15 11234567891012141618
16 1123456789101214161820
17 112345678910121416182022
18 11234567891012141618202224

List of values

[1, 11, 112, 1123, 11234, 112345, 1123456, 11234567, 112345678, 1123456789, 112345678910, 11234567891012, 1123456789101214, 112345678910121416, 11234567891012141618, 1123456789101214161820, 112345678910121416182022, 11234567891012141618202224]

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

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