A183932 Number of nondecreasing arrangements of n numbers in -6..6 with sum zero and sum of squares less than n*42/3.

1, 4, 15, 56, 157, 421, 1030, 2349, 5033, 10278, 20065, 37609, 68129, 119718, 204358, 340240, 553695, 882178, 1378928, 2117950, 3199767, 4762105, 6989141, 10123604, 14486392, 20495431, 28686822, 39751213, 54565631, 74232787, 100141371

Offset

1,2

Comments

Column 6 of A183935.

Links

R. H. Hardin, Table of n, a(n) for n = 1..71

Example

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

Crossrefs

Cf. A183935.

Sequence in context: A094375 A047018 A064813 * A009940 A081163 A082133

Adjacent sequences: A183929 A183930 A183931 * A183933 A183934 A183935

Keyword

nonn

Author

R. H. Hardin Jan 08 2011

Status

approved