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 A159088 #4 Feb 16 2025 08:33:10
%S A159088 1,37,892,18099,339095,6131634,109624680,1965843921,35681560273,
%T A159088 659532296861
%N A159088 Number of permutations of 1..n containing the relative rank sequence { 126453 } at any spacing.
%C A159088 Same series for 354621 423156 651324 354612 423165 216453 561324
%H A159088 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159088 A056986 A158005 A158423
%K A159088 nonn
%O A159088 6,2
%A A159088 _R. H. Hardin_ Apr 05 2009