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 A158433 #4 Feb 16 2025 08:33:09
%S A158433 1,26,459,7033,101913,1453421,20844529,304575247,4573536631,
%T A158433 71012777592,1145330103151
%N A158433 Number of permutations of 1..n containing the relative rank sequence { 51324 } at any spacing.
%C A158433 Same series for 24351 42315 15342
%H A158433 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A158433 A056986 A158005
%K A158433 nonn
%O A158433 5,2
%A A158433 _R. H. Hardin_ Mar 18 2009