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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A090787 Number of ways to get n by evaluating 1 (+ or *) 2 (+ or *) 3 ... (+ or *) m for some positive integer m. No parentheses are allowed and the usual order of precedence (* before +) is followed. 0
1, 1, 1, 0, 1, 2, 1, 0, 1, 2, 1, 0, 0, 2, 3, 1, 0, 0, 1, 2, 2, 1, 0, 1, 3, 3, 2, 2, 2, 1, 1, 3, 2, 0, 2, 3, 1, 1, 3, 4, 2, 1, 1, 2, 3, 3, 4, 2, 1, 2, 2, 1, 0, 3, 6, 5, 3, 1, 3, 3, 2, 3, 2, 3, 5, 5, 3, 4, 6, 4, 2, 1, 2, 4, 4, 5, 6, 7, 5, 2, 2, 2, 3, 5, 6, 4, 2, 6, 7, 4, 4, 4, 2, 2, 7, 9, 6, 3, 4, 7, 6, 4, 2, 4, 8 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

COMMENTS

Sequence suggested by Leroy Quet in SeqFan memo 3500 dated Feb 02 2004, where the first fifteen terms were given.

LINKS

Table of n, a(n) for n=1..105.

EXAMPLE

a(55)=6, since 55 = 1+2+3+4+5+6+7+8+9+10 = 1*2*3+4+5+6+7+8+9+10 = 1*2+3+4*5+6+7+8+9 = 1+2+3+4+5*6+7+8 = 1*2*3+4+5*6+7+8 = 1+2*3*4+5*6.

CROSSREFS

Sequence in context: A155077 A170968 A114114 * A229707 A262680 A191329

Adjacent sequences:  A090784 A090785 A090786 * A090788 A090789 A090790

KEYWORD

nonn

AUTHOR

John W. Layman, Feb 09 2004

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 August 23 22:45 EDT 2019. Contains 326254 sequences. (Running on oeis4.)