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 A159091 #4 Feb 16 2025 08:33:10
%S A159091 1,37,892,18096,338925,6125833,109468530,1962169602,35601982205,
%T A159091 657898464017
%N A159091 Number of permutations of 1..n containing the relative rank sequence { 132645 } at any spacing.
%C A159091 Same series for 465231 312546 132564 645213 546231 231546 645132
%H A159091 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159091 A056986 A158005 A158423
%K A159091 nonn
%O A159091 6,2
%A A159091 _R. H. Hardin_ Apr 05 2009