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 A159147 #4 Feb 16 2025 08:33:10
%S A159147 1,37,894,18212,342926,6233647,111989075,2016081083,36689790613,
%T A159147 679004889654
%N A159147 Number of permutations of 1..n containing the relative rank sequence { 235614 } at any spacing.
%C A159147 Same series for 416532 361245 542163 341562 436215 265143 512634
%H A159147 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159147 A056986 A158005 A158423
%K A159147 nonn
%O A159147 6,2
%A A159147 _R. H. Hardin_ Apr 05 2009