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 A249207 #7 Jul 23 2025 11:54:21 %S A249207 14336,51200,183516,658448,2363528,8486156,30475714,109474166, %T A249207 393232196,1412652056,5075187032,18233890510,65510631030,235369064306, %U A249207 845649181758,3038313571704,10916323664982,39221255161200,140918266479766 %N A249207 Number of length n+6 0..3 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 A249207 Column 3 of A249212 %H A249207 R. H. Hardin, <a href="/A249207/b249207.txt">Table of n, a(n) for n = 1..210</a> %e A249207 Some solutions for n=3 %e A249207 ..0....0....2....2....0....2....0....2....2....2....2....2....0....2....0....2 %e A249207 ..2....3....3....2....2....2....1....0....2....0....0....2....0....2....3....3 %e A249207 ..2....1....0....2....2....2....2....2....2....1....2....3....0....0....2....0 %e A249207 ..3....0....2....2....0....3....0....3....3....2....3....2....2....3....2....1 %e A249207 ..1....2....0....0....2....0....1....3....0....2....2....2....1....0....1....0 %e A249207 ..1....0....2....3....2....1....1....1....2....3....0....0....0....1....0....2 %e A249207 ..1....0....3....0....0....2....3....1....1....0....0....1....3....0....2....3 %e A249207 ..2....0....0....1....2....0....3....3....1....0....2....0....3....0....1....2 %e A249207 ..2....2....3....2....2....3....2....2....3....1....0....1....2....3....3....2 %K A249207 nonn %O A249207 1,1 %A A249207 _R. H. Hardin_, Oct 23 2014