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 A200268 #6 Jul 22 2025 15:45:55 %S A200268 1,5,7,9,13,13,21,31,19,37,75,139,97,181,101,225,277,505,465,971,225 %N A200268 Number of 0..4 arrays x(0..n+1) of n+2 elements with zero n-1st differences. %C A200268 Column 4 of A200272 %e A200268 All solutions for n=6 %e A200268 ..2....0....1....1....2....2....3....4....3....2....3....2....1 %e A200268 ..0....0....0....1....4....1....2....4....3....2....4....3....2 %e A200268 ..2....0....1....1....2....2....3....4....3....2....3....2....1 %e A200268 ..4....0....2....1....0....3....4....4....3....2....2....1....0 %e A200268 ..4....0....2....1....0....3....4....4....3....2....2....1....0 %e A200268 ..2....0....1....1....2....2....3....4....3....2....3....2....1 %e A200268 ..0....0....0....1....4....1....2....4....3....2....4....3....2 %e A200268 ..2....0....1....1....2....2....3....4....3....2....3....2....1 %K A200268 nonn %O A200268 1,2 %A A200268 _R. H. Hardin_ Nov 15 2011