A202123 Number of -7..7 arrays of n elements with first, second and third differences also in -7..7.

15, 169, 1483, 9739, 65773, 443169, 2993875, 20229855, 136692527, 923636217, 6241166303, 42172597643, 284966475203, 1925560567969, 13011302413343, 87919326690553, 594084073349817, 4014315174232981, 27125329889094427

Offset: 1

Author

R. H. Hardin Dec 11 2011

Keywords

• nonn

Comments

Column 7 of A202124

Examples

			Some solutions for n=5
..1....0...-2....7....6....0....0...-3....1...-4...-2....6...-6....2...-4....2
..5....0....1....5...-1....7....1...-2....4...-2....0....3...-2....3...-2...-5
..7...-2....0....0...-4....7....5....0....3....2....4...-3....0....5...-3...-7
..7...-1....1...-5...-2....4....5...-1....3....2....5...-7....0....5...-2...-6
..0...-1....7...-6....0....2....6...-7...-3....4....3...-4....2....0...-3...-2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210