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 A159120 #4 Feb 16 2025 08:33:10
%S A159120 1,37,894,18200,342214,6208495,111295055,1999484404,36327262008,
%T A159120 671548748326
%N A159120 Number of permutations of 1..n containing the relative rank sequence { 146352 } at any spacing.
%C A159120 Same series for 253641 524136 631425 352461 425316 164253 613524
%H A159120 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PermutationPattern.html">Permutation Pattern</a>
%Y A159120 A056986 A158005 A158423
%K A159120 nonn
%O A159120 6,2
%A A159120 _R. H. Hardin_ Apr 05 2009