A200549 Number of -4..4 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.

52, 446, 3396, 26850, 211374, 1689732, 13587804, 109957140, 893510530, 7288331916, 59637096784, 489325754576, 4024444316206, 33167657580268, 273853057747366, 2264784856966600, 18757225819498566, 155553439876468586

Offset: 1

Author

R. H. Hardin Nov 19 2011

Keywords

• nonn

Comments

Column 4 of A200553

Examples

			Some solutions for n=3
..0....0...-3...-3...-1...-4...-1....1...-2...-3....0...-1...-1...-2....1...-3
..2...-1....3....2....1...-4....3....2...-3....0....3....1....3...-3...-2....1
.-4....2...-4....1...-2....1....0...-4....4...-3....4...-1...-2...-3....2....3
..0...-4....3....1...-1....3....2....4...-1....3...-3...-1...-1....4....1....3
..2....3....1...-1....3....4...-4...-3....2....3...-4....2....1....4...-2...-4
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200