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 A200163 #6 Jul 22 2025 15:42:53 %S A200163 12,120,1326,13888,145482,1504820,15586972,160772064,1658521710 %N A200163 Number of -6..6 arrays x(0..n-1) of n elements with nonzero sum and with zero through n-1 differences all nonzero. %C A200163 Column 6 of A200165 %e A200163 Some solutions for n=5 %e A200163 .-2....6...-1...-6...-2....2....4....4...-2....3....4....5....3....4....2....2 %e A200163 ..5...-3....1...-2...-3...-4...-1...-4...-3...-3...-3....1....4...-6....1....5 %e A200163 .-4....2....4....4...-6...-6...-5....3...-5....1...-4....2...-6....5....4....1 %e A200163 .-2....3...-4...-5....4....6....4...-1...-3...-3...-2...-3...-1....2...-4....2 %e A200163 .-1....1...-1...-2...-5...-2...-6....3....6...-4...-6....6...-5...-6....4....4 %K A200163 nonn %O A200163 1,1 %A A200163 _R. H. Hardin_ Nov 13 2011