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 A179958 #11 Feb 12 2025 15:29:48 %S A179958 1,1,0,0,0,0,0,0,0,0,2,160,6056,161136,3661824,76972416,1572313392, %T A179958 32096768008,665456850864,14144815265510,309931658271656, %U A179958 7021414359095808 %N A179958 Number of permutations of 1..n such that |p(i)-p(i-1)| >= 5 for i>1. %C A179958 Permutations such that the absolute difference between adjacent elements is at least 5. %K A179958 nonn %O A179958 0,11 %A A179958 _R. H. Hardin_, Aug 03 2010 %E A179958 a(0), a(19)-a(20) from _Alois P. Heinz_, Oct 27 2014 %E A179958 a(21) from _Alois P. Heinz_, Feb 10 2025