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 A204772 #27 Dec 07 2019 14:53:03 %S A204772 1,4,16,76,120,127 %N A204772 "Fairly optimal" shellsort sequence for reverse-sorting an ascending sequence of size N=128. %C A204772 This is a fairly optimal sequence for reverse-sorting an ascending list where N = 128. Requires 4.875*N comparisons. 4.875 is approximately equal to 2.31*log_10(128). The operation performed requires a defined, substantial and certainly nontrivial amount of work which is repeatable for a list of any size. %F A204772 Determined empirically. %K A204772 nonn,fini,full %O A204772 1,2 %A A204772 _Olof Forshell_, Jan 22 2012