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 A158436 #4 Feb 16 2025 08:33:10
%S A158436 1,26,458,6995,101017,1436410,20558210,300096925,4506703037,
%T A158436 70045662118,1131619058381
%N A158436 Number of permutations of 1..n containing the relative rank sequence { 52341 } at any spacing.
%C A158436 Same series for 14325
%H A158436 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A158436 A056986 A158005
%K A158436 nonn
%O A158436 5,2
%A A158436 _R. H. Hardin_ Mar 18 2009