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

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A181959 Number of distinct integers that can be generated by an expression containing n binary operators (any of add, subtract, multiply and divide) whose operands are any integer between 1 and 9; parenthesis allowed. 5
9, 48, 236, 1274, 6489, 30229, 142320, 711955, 3601566 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..8.

Derek M. Jones, R program to generate list

Index to sequences related to the complexity of n

EXAMPLE

a(1)=48, the distinct values are -8 -7 -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 20 21 24 25 27 28 30 32 35 36 40 42 45 48 49 54 56 63 64 72 81

CROSSREFS

Cf. A181898, A181957, A181958, A181960.

Sequence in context: A055582 A054460 A115053 * A171011 A226751 A073584

Adjacent sequences:  A181956 A181957 A181958 * A181960 A181961 A181962

KEYWORD

nonn

AUTHOR

Derek M. Jones, Apr 03 2012

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.

Content is available under The OEIS End-User License Agreement .

Last modified April 21 11:47 EDT 2014. Contains 240824 sequences.