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 A159099 #4 Feb 16 2025 08:33:10
%S A159099 1,37,894,18198,342081,6203273,111136050,1995314753,36227939331,
%T A159099 669331964214
%N A159099 Number of permutations of 1..n containing the relative rank sequence { 135426 } at any spacing.
%C A159099 Same series for 624531 153246 642351 625341 152436 143526 634251
%H A159099 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159099 A056986 A158005 A158423
%K A159099 nonn
%O A159099 6,2
%A A159099 _R. H. Hardin_ Apr 05 2009