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 A158427 #4 Feb 16 2025 08:33:09
%S A158427 1,26,461,7102,103397,1479242,21244523,310353510,4653395194,
%T A158427 72084982176,1159451127978
%N A158427 Number of permutations of 1..n containing the relative rank sequence { 41532 } at any spacing.
%C A158427 Same series for 35214 31452 41253 25413 23514 43152 25134
%H A158427 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A158427 A056986 A158005
%K A158427 nonn
%O A158427 5,2
%A A158427 _R. H. Hardin_ Mar 18 2009