login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A183929 Number of nondecreasing arrangements of n numbers in -3..3 with sum zero and sum of squares less than n*12/3 1
1, 2, 5, 11, 21, 36, 60, 95, 143, 212, 302, 424, 582, 784, 1034, 1355, 1736, 2207, 2776, 3455, 4252, 5213, 6315, 7607, 9105, 10826, 12786, 15053, 17595, 20488, 23752, 27416, 31497, 36092, 41169, 46821, 53078, 59989, 67574, 75963, 85103, 95134, 106094 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A183935

LINKS

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

FORMULA

Empirical: a(n)=2*a(n-1)-a(n-2)-a(n-5)+2*a(n-6)-a(n-7)+a(n-8)-a(n-9)-a(n-10)+a(n-11)+a(n-13)-a(n-14)-a(n-16)+2*a(n-18)-a(n-19)+a(n-20)-2*a(n-21)+a(n-23)+a(n-24)-a(n-25)-a(n-28)+2*a(n-29)-a(n-30)-a(n-33)+2*a(n-34)-a(n-35)-a(n-38)+a(n-39)+a(n-40)-2*a(n-42)+a(n-43)-a(n-44)+2*a(n-45)-a(n-47)-a(n-49)+a(n-50)+a(n-52)-a(n-53)-a(n-54)+a(n-55)-a(n-56)+2*a(n-57)-a(n-58)-a(n-61)+2*a(n-62)-a(n-63)

EXAMPLE

All solutions for n=4

.-1...-3....0...-2...-3...-2...-1...-1...-1...-2...-2

..0....0....0....0....1...-1...-1...-1...-1....0...-1

..0....1....0....0....1....0....0....1...-1....1....1

..1....2....0....2....1....3....2....1....3....1....2

CROSSREFS

Sequence in context: A100134 A137356 A103198 * A003522 A112805 A119970

Adjacent sequences:  A183926 A183927 A183928 * A183930 A183931 A183932

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 30 06:11 EST 2020. Contains 338781 sequences. (Running on oeis4.)