cp's OEIS Frontend

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.

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A163949 The number of functions in a finite set that are not obtainable by a composition power of any other function. Similar to A163947, but it excludes self compositions.

Original entry on oeis.org

0, 3, 15, 138, 1720, 27180, 522984
Offset: 1

Views

Author

Carlos Alves, Aug 06 2009

Keywords

Comments

It is similar to A163947, but the difference is expressed by the nontrivial sequence: 0, 3, 9, 54, 320, 1590, 6552... excluding solutions by powers of the function itself.

Crossrefs

Cf. A163947, A163950.

Formula

a(n) = n^n - A163950(n).
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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