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 A159142 #4 Feb 16 2025 08:33:10
%S A159142 1,37,893,18147,340508,6164947,110320096,1979352513,35932666632,
%T A159142 664075359756
%N A159142 Number of permutations of 1..n containing the relative rank sequence { 214635 } at any spacing.
%C A159142 Same series for 536421 241356 124635 653142 463521 314256 125364 652413 536412 241365 563142 463512 314265 215364 562413
%H A159142 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159142 A056986 A158005 A158423
%K A159142 nonn
%O A159142 6,2
%A A159142 _R. H. Hardin_ Apr 05 2009