A183931 Number of nondecreasing arrangements of n numbers in -5..5 with sum zero and sum of squares less than n*30/3

1, 4, 12, 36, 89, 211, 457, 938, 1828, 3390, 6009, 10328, 17191, 27843, 43962, 67932, 102768, 152734, 223096, 320963, 455194, 637179, 880985, 1204511, 1629348, 2182512, 2896434, 3810960, 4973139, 6440436, 8280160, 10572838, 13412773

Offset

1,2

Comments

Column 5 of A183935

Links

R. H. Hardin, Table of n, a(n) for n = 1..169

Example

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

Crossrefs

Sequence in context: A357061 A190072 A063810 * A320967 A261584 A347990

Adjacent sequences: A183928 A183929 A183930 * A183932 A183933 A183934

Keyword

nonn

Author

R. H. Hardin Jan 08 2011

Status

approved