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 A269117 #6 Mar 02 2016 21:09:18 %S A269117 0,0,1,1850672,11690616534627,246211478304046636024, %T A269117 14919265746950486383601562197,2285085934263252199073238394141449534, %U A269117 798203800902002138190338074022806761037450631,586566986371155102435901052470650279895779757665905993 %N A269117 Number of sequences with 7 copies each of 1,2,...,n avoiding the pattern 12...n. %H A269117 Alois P. Heinz, <a href="/A269117/b269117.txt">Table of n, a(n) for n = 0..80</a> %F A269117 a(n) = A172603(n) - A268850(n). %Y A269117 Column k=7 of A269129. %Y A269117 Cf. A172603, A268850. %K A269117 nonn %O A269117 0,4 %A A269117 _Alois P. Heinz_, Feb 19 2016