A184245 Number of strings of numbers x(i=1..7) in 0..n with sum i^2*x(i)^2 equal to n^2*49.

2, 4, 41, 31, 213, 176, 706, 571, 2355, 1508, 5431, 3445, 10802, 6673, 22692, 13525, 39450, 21062, 62786, 39829, 103520, 54727, 160264, 88909, 241185, 123101, 329276, 192191, 488530, 242300, 650781, 371934, 859075, 437857, 1241808, 621669, 1539413

Offset: 1

Author

R. H. Hardin Jan 10 2011

Keywords

• nonn

Comments

Row 7 of A184240

Examples

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