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 A269125 #6 Mar 02 2016 21:18:37 %S A269125 1,5039,674641325,171248808285596,54391509124298646609, %T A269125 18675035107760751336633904,6541943110420293280017597411002, %U A269125 2285085934263252199073238394141449534,789007694236868030155290867470985247486401,268568796699793322439632085075432144258760935329 %N A269125 Number of sequences with n copies each of 1,2,...,7 avoiding the pattern 12...7. %H A269125 Alois P. Heinz, <a href="/A269125/b269125.txt">Table of n, a(n) for n = 0..100</a> %F A269125 a(n) = A071549(n) - A268843(n). %Y A269125 Row n=7 of A269129. %Y A269125 Cf. A071549, A268843. %K A269125 nonn %O A269125 0,2 %A A269125 _Alois P. Heinz_, Feb 19 2016