A184238 Number of strings of numbers x(i=1..n) in 0..7 with sum i^2*x(i)^2 equal to n^2*49.

1, 1, 1, 2, 30, 47, 706, 2108, 19178, 97714, 592976, 4314051, 20748316, 146773816, 682184037, 4255325221, 20091607500, 109644051939, 531805180789, 2616813468267, 12881990830635, 59476915385038, 291195760216883

Offset: 1

Author

R. H. Hardin Jan 10 2011

Keywords

• nonn

Comments

Column 7 of A184240

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..24