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 A159103 #4 Feb 16 2025 08:33:10
%S A159103 1,37,895,18247,343572,6239984,111942670,2011895627,36555126641,
%T A159103 675623987378
%N A159103 Number of permutations of 1..n containing the relative rank sequence { 136245 } at any spacing.
%C A159103 Same series for 542631 235146 641532 365241 412536 142563 635214
%H A159103 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159103 A056986 A158005 A158423
%K A159103 nonn
%O A159103 6,2
%A A159103 _R. H. Hardin_ Apr 05 2009