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 A159149 #4 Feb 16 2025 08:33:10
%S A159149 1,37,894,18209,342746,6227216,111809573,2011739254,36593905375,
%T A159149 677012700022
%N A159149 Number of permutations of 1..n containing the relative rank sequence { 236154 } at any spacing.
%C A159149 Same series for 451632 326145 541623 412653 365124 356214 421563
%H A159149 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159149 A056986 A158005 A158423
%K A159149 nonn
%O A159149 6,2
%A A159149 _R. H. Hardin_ Apr 05 2009