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 A200152 #6 Jul 22 2025 15:41:57 %S A200152 1,7,25,107,381,1589,5153,18809,68813,256859,883247,4997167,12448095, %T A200152 76804553,181129817,522024177,1884097881,16163873397,38888615377, %U A200152 239811969005 %N A200152 Number of 0..6 arrays x(0..n-1) of n elements with zero n-1st difference. %C A200152 Column 6 of A200154 %e A200152 Some solutions for n=6 %e A200152 ..1....1....6....5....5....3....5....0....0....0....6....2....0....4....2....5 %e A200152 ..6....4....6....4....1....4....6....0....6....2....6....6....2....4....2....2 %e A200152 ..2....2....5....4....2....0....3....2....3....3....4....6....0....4....2....2 %e A200152 ..0....2....3....4....3....1....2....2....2....3....2....6....2....3....4....1 %e A200152 ..3....4....2....4....3....6....4....0....4....3....2....6....6....2....6....0 %e A200152 ..6....1....6....5....5....3....5....0....0....5....6....2....0....4....2....5 %K A200152 nonn %O A200152 1,2 %A A200152 _R. H. Hardin_ Nov 13 2011