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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.

A004073 Start with a(1)=1; to get a(n) replace each i in a(n-1) with 12...i, then append n.

Table of values

n a(n)
1 1
2 12
3 1123
4 11121234
5 1111211212312345
6 11111211121121231121231234123456
7 1111112111121112112123111211212311212312341121231234123451234567

List of values

[1, 12, 1123, 11121234, 1111211212312345, 11111211121121231121231234123456, 1111112111121112112123111211212311212312341121231234123451234567]

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

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