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 A159145 #4 Feb 16 2025 08:33:10
%S A159145 1,37,894,18205,342527,6220027,111624374,2007591333,36508865444,
%T A159145 675368719140
%N A159145 Number of permutations of 1..n containing the relative rank sequence { 234615 } at any spacing.
%C A159145 Same series for 516432 261345 543162 314562 463215 265413 512364
%H A159145 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159145 A056986 A158005 A158423
%K A159145 nonn
%O A159145 6,2
%A A159145 _R. H. Hardin_ Apr 05 2009