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 A159104 #4 Feb 16 2025 08:33:10
%S A159104 1,37,894,18199,342140,6205428,111199318,1996955286,36267229831,
%T A159104 670222865921
%N A159104 Number of permutations of 1..n containing the relative rank sequence { 136254 } at any spacing.
%C A159104 Same series for 452631 325146 641523 356241 421536 142653 635124
%H A159104 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159104 A056986 A158005 A158423
%K A159104 nonn
%O A159104 6,2
%A A159104 _R. H. Hardin_ Apr 05 2009