A183951 Number of strings of numbers x(i=1..n) in 0..7 with sum i^2*x(i) equal to n^2*7.

1, 2, 7, 32, 161, 770, 3539, 15601, 65909, 268008, 1051270, 3988203, 14668943, 52424801, 182419618, 619151665, 2053195642, 6662236128, 21181322973, 66063536142, 202362531609, 609394911084, 1805804155160, 5270044397919

Offset: 1

Author

R. H. Hardin Jan 08 2011

Keywords

• nonn

Comments

Column 7 of A183953

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..52