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 A200266 #7 Jul 22 2025 15:45:41 %S A200266 1,3,3,3,5,5,5,7,3,3,7,9,11,17,5,3,13,17,15,21,5,9,21,19,9,13,3,5,21, %T A200266 17 %N A200266 Number of 0..2 arrays x(0..n+1) of n+2 elements with zero n-1st differences. %C A200266 Column 2 of A200272 %e A200266 All solutions for n=6 %e A200266 ..1....1....0....1....2 %e A200266 ..0....2....0....1....2 %e A200266 ..1....1....0....1....2 %e A200266 ..2....0....0....1....2 %e A200266 ..2....0....0....1....2 %e A200266 ..1....1....0....1....2 %e A200266 ..0....2....0....1....2 %e A200266 ..1....1....0....1....2 %K A200266 nonn %O A200266 1,2 %A A200266 _R. H. Hardin_ Nov 15 2011