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 A159154 #4 Feb 16 2025 08:33:10
%S A159154 1,37,894,18208,342687,6225173,111754800,2010473163,36567244103,
%T A159154 676484513037
%N A159154 Number of permutations of 1..n containing the relative rank sequence { 243615 } at any spacing.
%C A159154 Same series for 516342 261435 534162 315462 462315 264513 513264
%H A159154 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159154 A056986 A158005 A158423
%K A159154 nonn
%O A159154 6,2
%A A159154 _R. H. Hardin_ Apr 05 2009