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!)
A105863 a(n) = n * Sum_{d|n} (binomial(n,d) / gcd(n,d)). 2
1, 6, 12, 44, 30, 252, 56, 856, 846, 3080, 132, 20616, 182, 49532, 52110, 237232, 306, 1227096, 380, 4106320, 2470272, 15525092, 552, 86092176, 1328900, 270424752, 126624006, 1157002616, 870, 5577100260, 992, 19572325728, 6386892930 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = n * A056045(n) = n * Sum_{d|n} (binomial(n, d) / gcd(n, d)).
MATHEMATICA
f[n_] := Block[{d = Divisors[n]}, n*Plus @@ (Binomial[n, d])]; Table[ f[n], {n, 34}]
CROSSREFS
Sequence in context: A219522 A034529 A121160 * A052904 A106692 A032470
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Apr 23 2005
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 April 21 23:01 EDT 2024. Contains 371886 sequences. (Running on oeis4.)