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 A200080 #6 Jul 22 2025 15:40:27 %S A200080 1,7,17,43,111,245,429,855,1863,3573,10241,30645,50043,160499,149009, %T A200080 149121,755895,3366835 %N A200080 Number of 0..6 arrays x(0..n) of n+1 elements with zero n-1st differences. %C A200080 Column 6 of A200082 %e A200080 Some solutions for n=6 %e A200080 ..0....4....3....3....5....5....0....5....5....5....5....6....5....0....2....0 %e A200080 ..3....5....0....1....5....0....0....5....1....0....3....0....5....1....1....3 %e A200080 ..5....3....0....1....2....3....2....3....4....0....4....1....4....0....0....4 %e A200080 ..6....2....1....2....1....5....4....2....6....2....4....3....2....0....0....3 %e A200080 ..6....3....2....3....3....3....5....3....4....4....2....3....0....2....1....1 %e A200080 ..5....4....3....3....5....0....5....5....0....5....0....1....0....5....2....0 %e A200080 ..3....0....5....1....0....5....5....5....1....5....3....0....5....6....1....3 %K A200080 nonn %O A200080 1,2 %A A200080 _R. H. Hardin_ Nov 13 2011