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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A196244 Number of distinct values taken by r^r^...^r where r=1/2 (with n r's and parentheses inserted in all possible ways). 7
1, 1, 2, 4, 9, 20, 47, 111, 271, 670, 1685, 4295, 11074, 28824 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..14.

MATHEMATICA

f[1] = {1/2}; f[n_] := f[n] = Union[Flatten[Table[Outer[Power, f[k], f[n - k]], {k, n - 1}]], SameTest -> Equal]; Table[Length[f[n]], {n, 1, 10}] (* Vladimir Reshetnikov, Nov 01 2011 *)

CROSSREFS

Cf. A002845, A082499.

Sequence in context: A022543 A036618 A003018 * A035084 A213905 A058385

Adjacent sequences:  A196241 A196242 A196243 * A196245 A196246 A196247

KEYWORD

nonn,more

AUTHOR

Vladimir Reshetnikov, Oct 27 2011

EXTENSIONS

a(13)-a(14) from Alois P. Heinz, Feb 20 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 18 07:58 EDT 2018. Contains 316307 sequences. (Running on oeis4.)