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

 

Logo

The OEIS Foundation is grateful to everyone who made a donation during our Annual Appeal.     Visit the new and spectacular Pictures from the OEIS page!

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A007599 a(n+1) = a(n)+a(a(a(..(n-1)..))), depth [ n/2 ].
(Formerly M0455)
3
1, 0, 1, 1, 1, 1, 2, 3, 4, 5, 5, 5, 6, 7, 8, 9, 9, 9, 10, 11, 11, 11, 12, 13, 14, 15, 15, 15, 16, 17, 17, 17, 18, 19, 19, 19, 20, 21, 21, 21, 22, 23, 24, 25, 25, 25, 26, 27, 27, 27, 28, 29, 29, 29, 30, 31, 31, 31, 32, 33, 33, 33, 34, 35, 35, 35, 36, 37, 37, 37, 38, 39, 39, 39, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

T. D. Noe, Table of n, a(n) for n=0..1000

MATHEMATICA

a[n_Integer] := a[n] = (a[n - 1] + Nest[a, n - 2, Floor[n/2] ] ); a[0] = 1; a[1] = 0; Table[ a[n], {n, 0, 75} ]

PROG

(Haskell)

a007599 n = a007599_list !! n

a007599_list = 1 : f 1 1  where

   f x m = y : f y (m + 1) where

     y = x + (iterate a007599 (m-2)) !! (m `div` 2)

-- Reinhard Zumkeller, Jan 05 2012

CROSSREFS

Sequence in context: A081610 A063273 A200262 * A154940 A133344 A091334

Adjacent sequences:  A007596 A007597 A007598 * A007600 A007601 A007602

KEYWORD

nonn,nice,easy

AUTHOR

N. J. A. Sloane, Mira Bernstein, Robert G. Wilson v

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy .

Last modified February 13 01:52 EST 2016. Contains 268229 sequences.