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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.

A317956 Apply the morphism X -> XYX, where Y=1 if X contains an odd number of 1's, otherwise Y = 2 n times to 1, and concatenate the resulting string.

Table of values

n a(n)
0 1
1 121
2 1211121
3 121112121211121
4 1211121212111211121112121211121
5 121112121211121112111212121112121211121212111211121112121211121

List of values

[1, 121, 1211121, 121112121211121, 1211121212111211121112121211121, 121112121211121112111212121112121211121212111211121112121211121]

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

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