login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A255239 Alternating row sums of triangle A255238. 1
1, 1, 2, 3, 3, 4, 3, 5, 4, 7, 6, 8, 7, 10, 6, 9, 6, 11, 9, 14, 11, 15, 10, 15, 11, 14, 11, 18, 14, 19, 14, 18, 13, 20, 15, 23, 16, 25, 21, 24, 19, 23, 16, 27, 20, 28, 21, 30, 22, 27, 22, 31, 25, 34, 27, 35, 24, 35, 26, 32, 29, 36, 26, 39, 28 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
See A255238 for a Gauss' circle problem comment and a link.
LINKS
FORMULA
a(n) = sum((-1)^m*T(n, m), m = 0..n), n >= 0, with T(n, m) = A255238(n, m) = 1 + floor(sqrt(n^2 - m^2)).
CROSSREFS
Cf. A255238.
Sequence in context: A351085 A049878 A038203 * A316339 A186971 A329255
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Mar 12 2015
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)