A200274 Number of 0..n arrays x(0..6) of 7 elements with zero 4th differences.

2, 5, 8, 13, 18, 37, 64, 97, 140, 207, 286, 399, 528, 687, 878, 1127, 1408, 1749, 2130, 2607, 3128, 3743, 4414, 5191, 6056, 7067, 8156, 9387, 10706, 12241, 13876, 15717, 17670, 19829, 22172, 24787, 27542, 30571, 33752, 37317, 41058, 45153, 49440, 54073

Offset: 1

Author

R. H. Hardin, Nov 15 2011

Keywords

• nonn

Comments

Row 5 of A200272.

Examples

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

Links

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

Crossrefs

Cf. A200272.

Formula

Empirical: a(n) = a(n-5) +a(n-9) +a(n-10) -a(n-14) -a(n-15) -a(n-19) +a(n-20) +a(n-24) -a(n-25) -a(n-29) -a(n-30) +a(n-34) +a(n-35) +a(n-36) +a(n-39) -a(n-41) -a(n-44) -a(n-45) -a(n-46) +a(n-50) +a(n-51) +a(n-55) -a(n-56) -a(n-60) +a(n-61) +a(n-65) +a(n-66) -a(n-70) -a(n-71) -a(n-75) +a(n-80).