A183922 Number of nondecreasing arrangements of n numbers in -4..4 with sum zero and sum of squares not greater than n*20/3

1, 3, 8, 23, 48, 102, 186, 332, 596, 976, 1541, 2468, 3688, 5394, 7981, 11234, 15565, 21841, 29384, 39037, 52599, 68361, 87995, 114767, 145139, 182141, 231521, 286397, 352005, 438091, 532043, 642737, 785665, 939642, 1118744, 1347062, 1590039

Offset

1,2

Comments

Column 4 of A183927

Links

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

Example

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

Crossrefs

Sequence in context: A180621 A073051 A183930 * A340493 A296286 A068602

Adjacent sequences: A183919 A183920 A183921 * A183923 A183924 A183925

Keyword

nonn

Author

R. H. Hardin Jan 08 2011

Status

approved