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 A249218 #5 Jul 23 2025 11:55:35 %S A249218 3872,208876,8486156,107662502,950035900,6008974124,30726981418, %T A249218 127770780052,464154488364,1470845250424,4278893132168,11316587289834, %U A249218 28139818768978,65491995146282,145432249623888 %N A249218 Number of length 6+6 0..n arrays with no seven consecutive terms having five times the sum of any two elements equal to two times the sum of the remaining five. %C A249218 Row 6 of A249212 %e A249218 Some solutions for n=1 %e A249218 ..0....0....0....1....0....0....1....1....1....0....0....0....0....1....0....1 %e A249218 ..0....0....1....1....1....1....1....0....0....1....0....0....0....1....0....1 %e A249218 ..0....0....1....1....0....1....0....1....1....0....1....0....1....1....1....0 %e A249218 ..1....0....1....0....1....1....1....0....1....1....0....1....0....0....0....0 %e A249218 ..1....0....1....0....0....0....1....0....0....0....0....1....1....0....1....0 %e A249218 ..1....1....1....1....1....1....0....0....1....1....0....0....1....1....0....0 %e A249218 ..1....1....1....1....1....1....0....0....1....1....1....0....0....1....0....1 %e A249218 ..1....0....0....1....0....0....1....0....1....1....0....1....0....0....0....0 %e A249218 ..0....0....1....1....0....0....0....1....1....1....1....0....0....0....0....1 %e A249218 ..0....0....1....0....0....0....0....1....0....1....0....1....0....1....0....1 %e A249218 ..1....1....0....0....0....0....1....1....1....1....0....1....1....1....1....1 %e A249218 ..1....1....0....1....0....1....1....1....0....0....0....0....1....1....1....0 %K A249218 nonn %O A249218 1,1 %A A249218 _R. H. Hardin_, Oct 23 2014