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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A000308 a(n)=a(n-1)*a(n-2)*a(n-3) with a(1)=1, a(2)=2 and a(3)=3. 3
1, 2, 3, 6, 36, 648, 139968, 3265173504, 296148833645101056, 135345882205792807436868315512832, 130876399105969522361889021452224949874232743897657526714368 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

John Cerkan, Table of n, a(n) for n = 1..15

FORMULA

a(n) =2^A001590(n-1)*3^A000073(n-1). - Henry Bottomley, Jul 16 2001

EXAMPLE

a(6)=36*6*3=648.

MAPLE

A000308 := proc(n) option remember; if n <=3 then n else A000308(n-1)*A000308(n-2)*A000308(n-3); fi; end;

CROSSREFS

Cf. A000304, A000336, A063401.

Sequence in context: A263803 A178175 A129379 * A173501 A018340 A184716

Adjacent sequences:  A000305 A000306 A000307 * A000309 A000310 A000311

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

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 March 30 16:27 EDT 2017. Contains 284302 sequences.