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 A269114 #5 Feb 23 2016 12:02:06 %S A269114 0,0,1,3199,16140983,142951955371,2169397142273171, %T A269114 54391509124298646609,2179159866745975811590271, %U A269114 135383475007869462606521105767,12672963300072129619006691134123819,1737368296284036324230735297513232295869 %N A269114 Number of sequences with 4 copies each of 1,2,...,n avoiding the pattern 12...n. %H A269114 Alois P. Heinz, <a href="/A269114/b269114.txt">Table of n, a(n) for n = 0..100</a> %F A269114 a(n) = A014608(n) - A268847(n). %Y A269114 Column k=4 of A269129. %Y A269114 Cf. A014608, A268847. %K A269114 nonn %O A269114 0,4 %A A269114 _Alois P. Heinz_, Feb 19 2016