A184234 Number of strings of numbers x(i=1..n) in 0..3 with sum i^2*x(i)^2 equal to n^2*9.

1, 1, 2, 1, 5, 5, 41, 36, 199, 420, 1377, 4140, 10728, 36839, 87400, 283225, 660812, 1940633, 4609045, 12276261, 29878104, 73822900, 181872899, 428160287, 1053371836, 2416581766, 5864707345, 13309989382, 31614183273, 71451195226

Offset: 1

Author

R. H. Hardin Jan 10 2011

Keywords

• nonn

Comments

Column 3 of A184240

Examples

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

Links

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