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 A159156 #4 Feb 16 2025 08:33:10
%S A159156 1,37,893,18153,340896,6179596,110745737,1989952470,36171816761,
%T A159156 669125327823
%N A159156 Number of permutations of 1..n containing the relative rank sequence { 245613 } at any spacing.
%C A159156 Same series for 345162 432615 261543 516234 316542 461235 532164
%H A159156 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159156 A056986 A158005 A158423
%K A159156 nonn
%O A159156 6,2
%A A159156 _R. H. Hardin_ Apr 05 2009