login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A204321 Start with 4. Square the previous term and subtract it. 3
4, 12, 132, 17292, 298995972, 89398590973228812, 7992108067998667938125889533702532, 63873791370569400659097694858350356285036046451665934814399129508492 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..11

J. A. Haddley, Doubling Hypercuboids, Preprint 2015.

FORMULA

a(n) = a(n-1)*(a(n-1)-1).

a(n) ~ c^(2^n), where c = 1.8401979467004699327247921093647566233474761412868967823409865843403604499... . - Vaclav Kotesovec, Dec 18 2014

MAPLE

A204321 := proc(n)

        if n = 1 then

                4;

        else

                procname(n-1)*(procname(n-1)-1) ;

        end if;

end proc:

seq(A204321(n), n=1..10) ; # R. J. Mathar, Jan 19 2012

MATHEMATICA

Join[{a = 4}, Table[a = a^2 - a, {n, 9}]] (* Vladimir Joseph Stephan Orlovsky, Feb 24 2012 *)

RecurrenceTable[{a[1]==4, a[n] == a[n-1]*(a[n-1]-1)}, a, {n, 1, 10}] (* Vaclav Kotesovec, Dec 18 2014 *)

CROSSREFS

Sequence in context: A009663 A197899 A002029 * A152121 A077611 A052598

Adjacent sequences:  A204318 A204319 A204320 * A204322 A204323 A204324

KEYWORD

nonn

AUTHOR

Daniel Chiverton, Jan 14 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 19 17:44 EDT 2022. Contains 353847 sequences. (Running on oeis4.)