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!)
A232748 Partial sums of the characteristic function of Hofstadter's A030124. 4
0, 1, 1, 2, 3, 4, 4, 5, 6, 7, 8, 8, 9, 10, 11, 12, 13, 13, 14, 15, 16, 17, 18, 19, 20, 20, 21, 22, 23, 24, 25, 26, 27, 28, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Useful for computing A232749.

LINKS

Table of n, a(n) for n=1..68.

Index entries for Hofstadter-type sequences

FORMULA

a(1)=0, and for n>1, a(n) = A232748(n-1) + (1-(A232746(n)-A232746(n-1))).

PROG

(Scheme, with memoization macro definec from Antti Karttunen's IntSeq-library)

(definec (A232748 n) (cond ((< n 2) (- n 1)) (else (+ (A232748 (- n 1)) (- 1 (- (A232746 n) (A232746 (- n 1))))))))

CROSSREFS

Cf. A030124, A232746, A232749.

Sequence in context: A303787 A090223 A171974 * A308936 A187737 A109401

Adjacent sequences:  A232745 A232746 A232747 * A232749 A232750 A232751

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 30 2013

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 March 29 15:03 EDT 2020. Contains 333107 sequences. (Running on oeis4.)