A202660 Number of -4..4 arrays of n elements with first through fourth differences also in -4..4.

9, 61, 323, 1279, 3785, 11413, 34171, 102705, 308785, 928115, 2790241, 8389429, 25223913, 75838823, 228021213, 685581997, 2061310319, 6197655253, 18634234069, 56026786211, 168453450193, 506482113541, 1522819068075, 4578597906197

Offset: 1

Author

R. H. Hardin Dec 22 2011

Keywords

• nonn

Comments

Column 4 of A202664

Examples

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

Links

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