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 A249472 #6 Jul 23 2025 12:02:02 %S A249472 802,16800,412972,3791504,27309702,135637752,549183692,1882322198, %T A249472 5658152588,15260105412,37735175366,86590121782,186608489008, %U A249472 380873907090,742312367226,1387762688078,2501716768582,4364708959260 %N A249472 Number of length 6+4 0..n arrays with no five consecutive terms having four times any element equal to the sum of the remaining four. %C A249472 Row 6 of A249466 %H A249472 R. H. Hardin, <a href="/A249472/b249472.txt">Table of n, a(n) for n = 1..65</a> %e A249472 Some solutions for n=2 %e A249472 ..0....0....1....2....0....1....2....0....1....1....2....0....1....0....0....1 %e A249472 ..0....1....0....1....2....1....2....0....2....2....2....0....1....2....2....2 %e A249472 ..1....1....1....1....0....1....2....1....0....2....2....0....0....0....1....0 %e A249472 ..0....0....0....2....2....0....2....1....0....0....2....2....2....0....0....1 %e A249472 ..0....1....0....2....2....0....1....0....1....2....1....2....2....1....0....2 %e A249472 ..1....1....0....0....0....0....1....0....0....2....2....2....1....1....0....2 %e A249472 ..1....1....1....2....2....2....2....0....0....0....2....0....2....0....2....2 %e A249472 ..2....0....1....0....1....0....2....2....0....2....1....2....1....1....2....1 %e A249472 ..0....1....1....0....1....2....2....0....1....2....1....0....1....0....2....1 %e A249472 ..0....1....1....1....2....2....2....1....2....0....1....0....2....1....2....0 %K A249472 nonn %O A249472 1,1 %A A249472 _R. H. Hardin_, Oct 29 2014