A245137 Number of length 7 0..n arrays least squares fitting to a zero slope straight line, with a single point taken as having zero slope.

20, 195, 1064, 4005, 11856, 29813, 66256, 134091, 252060, 446193, 751536, 1214369, 1893612, 2863755, 4217056, 6065957, 8545968, 11819349, 16076760, 21542115, 28475524, 37176625, 47988672, 61303825, 77564708, 97271523, 120985592

Offset: 1

Author

R. H. Hardin, Jul 12 2014

Keywords

• nonn

Comments

Row 7 of A245134

Examples

			Some solutions for n=8
..4....6....4....0....5....5....4....1....6....5....6....5....3....5....1....3
..2....1....5....7....3....8....3....2....0....1....2....6....7....4....7....7
..1....8....1....6....8....8....7....3....2....6....2....7....0....7....4....1
..6....0....0....3....0....7....5....1....2....7....2....8....1....1....6....1
..5....2....5....2....7....5....0....5....1....7....7....6....8....5....2....6
..0....7....0....6....2....8....2....1....8....5....7....2....0....2....2....0
..4....4....6....2....6....6....7....1....1....2....1....8....5....7....5....6
		

Links

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

Formula

Empirical: a(n) = a(n-1) +3*a(n-2) -6*a(n-4) -6*a(n-5) +7*a(n-6) +11*a(n-7) -11*a(n-9) -7*a(n-10) +6*a(n-11) +6*a(n-12) -3*a(n-14) -a(n-15) +a(n-16)