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.
%I A163950 #4 Aug 17 2017 06:01:21 %S A163950 1,1,12,118,1405,19476,300559 %N A163950 The number of functions in a finite set that can be expressed by a composition power of another function. (It differs from A163948, as it excludes self compositions). %C A163950 The complementary set to A163949. %F A163950 a(n) = n^n - A163949(n). %Y A163950 Cf. A163947, A163948, A163949. %K A163950 more,nonn %O A163950 1,3 %A A163950 _Carlos Alves_, Aug 06 2009