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 A159144 #4 Feb 16 2025 08:33:10
%S A159144 1,37,892,18108,339637,6151057,110168393,1979041113,35974376270,
%T A159144 665655317842
%N A159144 Number of permutations of 1..n containing the relative rank sequence { 231645 } at any spacing.
%C A159144 Same series for 465132 312645 231564 546213 546132 465213 312564
%H A159144 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159144 A056986 A158005 A158423
%K A159144 nonn
%O A159144 6,2
%A A159144 _R. H. Hardin_ Apr 05 2009