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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A066957 a(n) = number of ways of placing '+' and '-' among the digits 123456789 so that the result of the expression is n, '-' before 1 IS allowed. 6
22, 43, 18, 41, 18, 40, 24, 39, 18, 46, 17, 38, 27, 38, 24, 43, 18, 39, 23, 37, 23, 43, 25, 36, 32, 36, 25, 44, 25, 35, 34, 31, 26, 37, 24, 35, 32, 32, 27, 37, 31, 26, 34, 34, 29, 42, 27, 27, 35, 26, 28, 35, 29, 33, 30, 26, 23, 29, 32, 25, 33, 30, 24, 34, 22, 26, 32, 30, 25 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

A066957(9)=46 is the largest term; A066957(456789)=2 is the last term greater than 1; a(n)=0 for n>123456789; 1715 terms are greater than 0; a(A136601(n))=0; a(A136602(n))>0; a(A136603(n))=1; partial sums are A136604. - Reinhard Zumkeller, Jan 12 2008

LINKS

R. Zumkeller, Table of n, a(n) for n = 0..10000

R. Zumkeller, Illustration of initial terms

CROSSREFS

Cf. A066956.

Sequence in context: A138040 A154087 A063327 * A118602 A215146 A086679

Adjacent sequences:  A066954 A066955 A066956 * A066958 A066959 A066960

KEYWORD

nice,nonn,base

AUTHOR

Miklos SZABO (mike(AT)ludens.elte.hu), Feb 01 2002

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 25 20:10 EDT 2019. Contains 321477 sequences. (Running on oeis4.)