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 A158435 #4 Feb 16 2025 08:33:10
%S A158435 1,26,459,7036,102033,1456346,20901218,305540295,4588693377,
%T A158435 71238558078
%N A158435 Number of permutations of 1..n containing the relative rank sequence { 52143 } at any spacing.
%C A158435 Same series for 32541 34125 14523
%H A158435 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A158435 A056986 A158005
%K A158435 nonn
%O A158435 5,2
%A A158435 _R. H. Hardin_ Mar 18 2009