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 A159102 #4 Feb 16 2025 08:33:10
%S A159102 1,37,894,18202,342356,6214281,111474723,2004234854,36440475644,
%T A159102 674063084277
%N A159102 Number of permutations of 1..n containing the relative rank sequence { 135642 } at any spacing.
%C A159102 Same series for 246531 531246 642135 435261 342516 162534 615243
%H A159102 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159102 A056986 A158005 A158423
%K A159102 nonn
%O A159102 6,2
%A A159102 _R. H. Hardin_ Apr 05 2009