A216630 Number of nondecreasing arrays of n 0..n-1 integers with the sum of their 2nd powers equal to sum(i^2,i=0..n-1).

1, 1, 1, 1, 2, 4, 14, 37, 105, 309, 939, 2903, 8865, 28163, 90648, 297615, 989077, 3320885, 11280835, 38583017, 133018026, 461630411, 1612842357, 5667628973, 20019876401, 71078302590, 253504107762, 908014000543, 3265037780657

Offset: 1

Author

R. H. Hardin Sep 11 2012

Keywords

• nonn

Comments

Column 2 of A216635

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..49