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 A159086 #4 Feb 16 2025 08:33:10
%S A159086 1,37,892,18102,339278,6138280,109813241,1970482132,35785828571,
%T A159086 661740800536
%N A159086 Number of permutations of 1..n containing the relative rank sequence { 125634 } at any spacing.
%C A159086 Same series for 436521 341256 652143 436512 341265 215634 562143
%H A159086 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159086 A056986 A158005 A158423
%K A159086 nonn
%O A159086 6,2
%A A159086 _R. H. Hardin_ Apr 05 2009