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 A158430 #4 Feb 16 2025 08:33:09
%S A158430 1,26,459,7035,101994,1455426,20884054,305260133,4584487108,
%T A158430 71178802896,1147757161265
%N A158430 Number of permutations of 1..n containing the relative rank sequence { 43125 } at any spacing.
%C A158430 Same series for 32451 34215 15423 51243 23541 14532 52134
%H A158430 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A158430 A056986 A158005
%K A158430 nonn
%O A158430 5,2
%A A158430 _R. H. Hardin_ Mar 18 2009