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 A163861 #14 Feb 02 2021 20:28:31 %S A163861 1,1,4,21,148,1281,12942,150955,2042272,31912425,567737326 %N A163861 Number of different 5th-power (quintic) mappings of a finite set of n elements into itself. %C A163861 The same as A102687 (square composition), A163859 (cubic composition), A163860 (4th-power composition), here a(n) is the number of different mappings g that admit at least one mapping f as the 5th-order root (g=fofofofof) in terms of the composition. %Y A163861 Cf. A102687, A163859, A163860. %Y A163861 Column k=5 of A247026. %K A163861 more,nonn %O A163861 0,3 %A A163861 _Carlos Alves_, Aug 05 2009 %E A163861 a(0) from _Alois P. Heinz_, Sep 09 2014 %E A163861 a(8)-a(10) from _Bert Dobbelaere_, Jan 24 2019