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Search: id:A164632
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A164632 a(1)=1 followed by 2^k appearing 2^(2*k-1) times for k>0. +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; listen)
OFFSET

1,2

COMMENT

Occured when analyzing A056753 to construct a recurrence.

LINKS

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

FORMULA

a=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).

CROSSREFS

Cf. A000079, A004171, A081294, A053644.

Sequence in context: A063511 A164717 A164715 this_sequence A063095 A156726 A082852

Adjacent sequences: A164629 A164630 A164631 this_sequence A164633 A164634 A164635

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 23 2009

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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