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 A159090 #4 Feb 16 2025 08:33:10
%S A159090 1,37,891,18041,337085,6076989,108331202,1937745128,35104098525,
%T A159090 648090669839
%N A159090 Number of permutations of 1..n containing the relative rank sequence { 132546 } at any spacing.
%C A159090 Same series for 645231
%H A159090 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159090 A056986 A158005 A158423
%K A159090 nonn
%O A159090 6,2
%A A159090 _R. H. Hardin_ Apr 05 2009