|
%I #5 Mar 31 2012 12:36:39
%S 362,21626,266812,1689732,7286542,24378976,68263780,167521092,
%T 371147726,758120242,1449515972,2623194882,4532144132,7526204850,
%U 12076969112,18807807576,28527996642,42270457652,61336410730,87344689150
%N Number of -n..n arrays x(0..7) of 8 elements with zero sum and nonzero second differences
%C Row 6 of A200553
%H R. H. Hardin, <a href="/A200558/b200558.txt">Table of n, a(n) for n = 1..58</a>
%e Some solutions for n=3
%e .-3....0....0...-3....1....1....1....1....0....0...-3...-3....1....1....1....0
%e ..3....1....0....3...-3....0...-3....1...-2....1....2....1....0...-2...-1...-2
%e ..0....3....3...-3....1....1...-1....0...-1....1...-3....0...-3...-2....0....1
%e ..2...-3...-2....2...-1...-2...-1...-2...-3....3...-1....2...-2....3....0...-2
%e ..2....2....1...-2....3....3....0...-2....1...-2....2....1....2....3....2....2
%e .-2...-3...-2...-2...-1...-3....3...-1....2....0....0....1...-3...-3....3....1
%e ..0....2...-1....2....1....2....1....2....0...-3....3...-1....2....2...-3...-1
%e .-2...-2....1....3...-1...-2....0....1....3....0....0...-1....3...-2...-2....1
%K nonn
%O 1,1
%A _R. H. Hardin_ Nov 19 2011
| 