A183930 Number of nondecreasing arrangements of n numbers in -4..4 with sum zero and sum of squares less than n*20/3

1, 3, 8, 23, 48, 97, 186, 332, 571, 976, 1541, 2369, 3688, 5394, 7734, 11234, 15565, 21232, 29384, 39037, 51295, 68361, 87995, 112274, 145139, 182141, 226917, 286397, 352005, 430099, 532043, 642737, 772601, 939642, 1118744, 1326218, 1590039

Offset

1,2

Comments

Column 4 of A183935

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

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

Crossrefs

Sequence in context: A373400 A180621 A073051 * A183922 A340493 A296286

Adjacent sequences: A183927 A183928 A183929 * A183931 A183932 A183933

Keyword

nonn

Author

R. H. Hardin Jan 08 2011

Status

approved