A200451 Number of -5..5 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.

72, 678, 5720, 50852, 451708, 4062384, 36725772, 334032710, 3050654456, 27965763262, 257160791680, 2371128350480, 21913699015614, 202938626310668, 1882772669652668, 17495621074794634, 162811923678190584

Offset: 1

Author

R. H. Hardin Nov 18 2011

Keywords

• nonn

Comments

Column 5 of A200454

Examples

			Some solutions for n=3
..5....5...-5...-5....1....1...-4....2...-1....2...-4....4....0....1....0....2
.-4...-4....4....3...-3...-2...-1....3....1...-4....2...-5....3...-5...-5...-5
..4....1...-5....5...-1....1....3....2...-2....0....4....5...-3....3....2...-2
..0....2....1...-5....0....3....2...-5...-1....3....2...-4....1....1...-1....0
.-5...-4....5....2....3...-3....0...-2....3...-1...-4....0...-1....0....4....5
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..158