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 A158424 #4 Feb 16 2025 08:33:09
%S A158424 1,26,459,7037,102075,1457407,20922336,305907060,4594540541,
%T A158424 71326622649,1149849718045
%N A158424 Number of permutations of 1..n containing the relative rank sequence { 41235 } at any spacing.
%C A158424 Same series for 43251 23415 15234 51432 25431 13452 53214
%H A158424 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A158424 A056986 A158005
%K A158424 nonn
%O A158424 5,2
%A A158424 _R. H. Hardin_ Mar 18 2009