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 A249007 #6 Jul 23 2025 11:50:10 %S A249007 802,16800,299044,2888944,20952218,99817384,418454994,1385871140, %T A249007 4201910020,11319995234,28417289280,65009432892,142222105640, %U A249007 290405064290,573014867750,1075969706928,1959720585922,3431451616020 %N A249007 Number of length 6+4 0..n arrays with no five consecutive terms having two times the sum of any three elements equal to three times the sum of the remaining two. %C A249007 Row 6 of A249001 %H A249007 R. H. Hardin, <a href="/A249007/b249007.txt">Table of n, a(n) for n = 1..65</a> %e A249007 Some solutions for n=2 %e A249007 ..2....1....1....0....0....0....0....0....1....0....0....0....2....2....0....1 %e A249007 ..1....0....1....0....2....0....2....0....2....1....0....2....1....2....2....1 %e A249007 ..0....0....1....0....0....1....0....2....2....1....0....0....0....2....1....2 %e A249007 ..2....1....2....1....1....0....2....1....1....0....1....2....2....1....0....2 %e A249007 ..2....1....1....0....1....1....0....1....1....0....1....2....2....1....0....1 %e A249007 ..2....2....2....1....0....0....0....0....1....1....1....1....1....0....1....0 %e A249007 ..1....0....1....0....0....1....1....2....1....0....0....1....2....0....1....1 %e A249007 ..1....0....2....0....2....2....0....2....0....0....0....0....2....1....1....2 %e A249007 ..2....1....2....0....1....2....1....2....1....0....0....2....2....0....0....2 %e A249007 ..2....0....1....1....1....2....0....0....1....1....0....2....1....2....0....1 %K A249007 nonn %O A249007 1,1 %A A249007 _R. H. Hardin_, Oct 18 2014