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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A025552 LCM of {C(0,0), C(1,0), ..., C(n, floor(n/2))}. 0
1, 1, 2, 6, 6, 30, 60, 420, 420, 1260, 1260, 13860, 13860, 180180, 360360, 360360, 360360, 6126120, 6126120, 116396280, 116396280, 116396280, 116396280, 2677114440, 2677114440, 13385572200, 13385572200, 40156716600, 40156716600, 1164544781400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..29.

FORMULA

Let b(n) = 2 if n = 2^m or n = 2^m + 1 for some m, otherwise 1; then a(n) = lcm({1,2,...,n}) / b(n). - Peter Luschny, Jun 26 2009

MAPLE

LCM := proc(n) option remember; if n < 2 then 1 else ilcm(n, LCM(n-1)) fi end;

a := proc(n) local i; add(i, i=convert(2*iquo(n+2, 2), base, 2)); `if`(%=1, LCM(n), LCM(n)/2) end: # Peter Luschny, Jun 26 2009

CROSSREFS

Cf. A003418. - Peter Luschny, Jun 26 2009

Sequence in context: A034386 A084343 A083907 * A284008 A284576 A060114

Adjacent sequences:  A025549 A025550 A025551 * A025553 A025554 A025555

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

Offset corrected by Peter Luschny, Jun 26 2009

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 July 25 19:05 EDT 2021. Contains 346291 sequences. (Running on oeis4.)