A184232 Number of strings of numbers x(i=1..n) in 0..n with sum i^2*x(i)^2 equal to n^4

1, 1, 2, 1, 15, 43, 706, 3719, 85718, 1186420, 21953477, 511276432, 9623532968, 260312395764

Offset

1,3

Comments

Diagonal of A184240

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A013076 A012890 A013073 * A074952 A078074 A016447

Adjacent sequences: A184229 A184230 A184231 * A184233 A184234 A184235

Keyword

nonn

Author

R. H. Hardin Jan 10 2011

Status

approved