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 A163948 #4 Aug 17 2017 05:59:08 %S A163948 1,4,21,172,1725,21066,307111 %N A163948 The number of functions on a finite set that are obtainable by a composition power (excluding identity as power). %C A163948 The complementary set to A163947. %F A163948 a(n) = n^n - A163947(n). %Y A163948 Cf. A163947, see also A102687, A163859, A163860, A163861. %K A163948 more,nonn %O A163948 1,2 %A A163948 _Carlos Alves_, Aug 06 2009