login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A053594 Open 3-dimensional ball numbers (version 2): a(n)= number of integer points (i,j,k) contained in a open ball of diameter n, centered at (1/2,0,0). 0
0, 0, 2, 10, 28, 60, 110, 174, 256, 368, 498, 682, 884, 1140, 1422, 1750, 2104, 2560, 3026, 3546, 4140, 4828, 5542, 6382, 7224, 8136, 9122, 10274, 11460, 12732, 14094, 15558, 17080, 18752, 20458, 22410, 24364, 26516, 28678, 31006, 33400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n)/(n/2)^3->4/3*Pi

LINKS

Table of n, a(n) for n=0..40.

CROSSREFS

Sequence in context: A057753 A060515 A109723 * A006331 A252591 A296849

Adjacent sequences:  A053591 A053592 A053593 * A053595 A053596 A053597

KEYWORD

easy,nonn

AUTHOR

Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 19 2000

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 12 05:52 EST 2019. Contains 329051 sequences. (Running on oeis4.)