A200548 Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.

30, 200, 1184, 7254, 43698, 266812, 1639804, 10152636, 63132188, 394016210, 2466471522, 15481097890, 97396742734, 614019893832, 3878005568152, 24532092598782, 155413031752230, 985836563404470, 6260856742508844

Offset: 1

Author

R. H. Hardin Nov 19 2011

Keywords

• nonn

Comments

Column 3 of A200553

Examples

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

Links

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