cp's OEIS Frontend

A200558 Number of -n..n arrays x(0..7) of 8 elements with zero sum and nonzero second differences.

%I A200558 #7 Jul 22 2025 15:52:38
%S A200558 362,21626,266812,1689732,7286542,24378976,68263780,167521092,
%T A200558 371147726,758120242,1449515972,2623194882,4532144132,7526204850,
%U A200558 12076969112,18807807576,28527996642,42270457652,61336410730,87344689150
%N A200558 Number of -n..n arrays x(0..7) of 8 elements with zero sum and nonzero second differences.
%C A200558 Row 6 of A200553
%H A200558 R. H. Hardin, <a href="/A200558/b200558.txt">Table of n, a(n) for n = 1..58</a>
%e A200558 Some solutions for n=3
%e A200558 .-3....0....0...-3....1....1....1....1....0....0...-3...-3....1....1....1....0
%e A200558 ..3....1....0....3...-3....0...-3....1...-2....1....2....1....0...-2...-1...-2
%e A200558 ..0....3....3...-3....1....1...-1....0...-1....1...-3....0...-3...-2....0....1
%e A200558 ..2...-3...-2....2...-1...-2...-1...-2...-3....3...-1....2...-2....3....0...-2
%e A200558 ..2....2....1...-2....3....3....0...-2....1...-2....2....1....2....3....2....2
%e A200558 .-2...-3...-2...-2...-1...-3....3...-1....2....0....0....1...-3...-3....3....1
%e A200558 ..0....2...-1....2....1....2....1....2....0...-3....3...-1....2....2...-3...-1
%e A200558 .-2...-2....1....3...-1...-2....0....1....3....0....0...-1....3...-2...-2....1
%K A200558 nonn
%O A200558 1,1
%A A200558 _R. H. Hardin_ Nov 19 2011