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 A179959 #9 Feb 12 2025 15:30:00 %S A179959 1,1,0,0,0,0,0,0,0,0,0,0,2,352,24440,1019616,33461568,957913824, %T A179959 25415753280,649347224736,16370397635328,413619939152632 %N A179959 Number of permutations of 1..n with no adjacent elements within 5 in value. %K A179959 nonn %O A179959 0,13 %A A179959 _R. H. Hardin_, Aug 03 2010 %E A179959 a(0)-a(10), a(20) from _Alois P. Heinz_, Oct 27 2014 %E A179959 a(21) from _Alois P. Heinz_, Feb 10 2025