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 A200076 #7 Oct 20 2022 23:03:24 %S A200076 1,3,3,3,7,9,9,15,7,3,11,29,43,73,25,5,27,53,97,123,29,41,93,85,35,35, %T A200076 17,9,55,73 %N A200076 Number of 0..2 arrays x(0..n) of n+1 elements with zero n-1st differences. %C A200076 Column 2 of A200082. %e A200076 All solutions for n=6 %e A200076 ..1....0....2....1....2....1....0....2....0 %e A200076 ..1....1....1....2....0....0....2....2....0 %e A200076 ..1....2....0....1....0....1....2....2....0 %e A200076 ..1....2....0....0....1....2....1....2....0 %e A200076 ..1....1....1....0....2....2....0....2....0 %e A200076 ..1....0....2....1....2....1....0....2....0 %e A200076 ..1....1....1....2....0....0....2....2....0 %Y A200076 Cf. A200082. %K A200076 nonn %O A200076 1,2 %A A200076 _R. H. Hardin_, Nov 13 2011