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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A164632 a(1)=1 followed by 2^k appearing 2^(2*k-1) times for k>0. 3
1, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Occured when analyzing A056753 to construct a recurrence.

LINKS

R. Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = f(n,1,1) with f(x,y,z) = if x=1 then z else if y=1 then f(x-1,2*z*z,2*z) else f(x-1,y-1,z).

PROG

(Haskell)

a164632 n = a164632_list !! (n-1)

a164632_list = 1 : concatMap (\x -> replicate (2^(2*x-1)) (2^x)) [1..]

-- Reinhard Zumkeller, Feb 24 2012, Oct 17 2010

CROSSREFS

Cf. A000079, A004171, A081294, A053644.

Sequence in context: A283207 A164717 A164715 * A063095 A156726 A082852

Adjacent sequences:  A164629 A164630 A164631 * A164633 A164634 A164635

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Aug 23 2009

EXTENSIONS

Typo in formula fixed by Reinhard Zumkeller, Oct 16 2010

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 16 23:12 EDT 2018. Contains 316275 sequences. (Running on oeis4.)