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 A321050 #5 Oct 26 2018 19:51:47 %S A321050 0,20,111,396,1285,4312,15437,55572,196288,678270,2311191,7856610, %T A321050 26732463,90996552,309390463,1049670138,3554983881,12027825752, %U A321050 40676758809,137534141216,464908099716,1571078027012,5307751810223,17928124690902,60548310641344 %N A321050 Number of permutations of [n] with no fixed points where the maximal displacement of an element equals four. %H A321050 Alois P. Heinz, <a href="/A321050/b321050.txt">Table of n, a(n) for n = 4..1000</a> %F A321050 a(n) = A259777(n) - A079997(n). %Y A321050 Column k=4 of A259784. %Y A321050 Cf. A079997, A259777. %K A321050 nonn,easy %O A321050 4,2 %A A321050 _Alois P. Heinz_, Oct 26 2018