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 A269127 #6 Mar 02 2016 21:16:11 %S A269127 1,362879,12498099730471,1072323973643442736211, %T A269127 135383475007869462606521105767, %U A269127 20584293980310480336378076914369061769,3413618982844502796240740610191874586048936771,586566986371155102435901052470650279895779757665905993 %N A269127 Number of sequences with n copies each of 1,2,...,9 avoiding the pattern 12...9. %H A269127 Alois P. Heinz, <a href="/A269127/b269127.txt">Table of n, a(n) for n = 0..50</a> %F A269127 a(n) = A071551(n) - A268845(n). %Y A269127 Row n=9 of A269129. %Y A269127 Cf. A071551, A268845. %K A269127 nonn %O A269127 0,2 %A A269127 _Alois P. Heinz_, Feb 19 2016