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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.

A259747 a(0) = 1; thereafter a(n) is the concatenation of a(n-1), n, a(n-1).

Table of values

n a(n)
0 1
1 111
2 1112111
3 111211131112111
4 1112111311121114111211131112111
5 111211131112111411121113111211151112111311121114111211131112111

List of values

[1, 111, 1112111, 111211131112111, 1112111311121114111211131112111, 111211131112111411121113111211151112111311121114111211131112111]

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

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