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 A159143 #4 Feb 16 2025 08:33:10
%S A159143 1,37,892,18101,339221,6136346,109762005,1969306328,35761194738,
%T A159143 661255164270
%N A159143 Number of permutations of 1..n containing the relative rank sequence { 216534 } at any spacing.
%C A159143 Same series for 346521 431256 125643 652134 435621 342156 126534 651243 346512 431265 215643 562134 435612 342165 561243
%H A159143 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159143 A056986 A158005 A158423
%K A159143 nonn
%O A159143 6,2
%A A159143 _R. H. Hardin_ Apr 05 2009