|
Search: id:A063401
|
|
|
| A063401 |
|
a(n)=a(n-1)*a(n-2)*a(n-3) with a(0)=1, a(1)=2, a(2)=2. |
|
+0
3
|
|
| 1, 2, 2, 4, 16, 128, 8192, 16777216, 17592186044416, 2417851639229258349412352, 713623846352979940529142984724747568191373312, 30354201441027016733116592294117482916287606860189680019559568902170379456331382\ 784
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
LINKS
|
Harry J. Smith, Table of n, a(n) for n=0,...,15
|
|
FORMULA
|
a(n) =2^A000073(n).
|
|
EXAMPLE
|
a(6)=128*16*4=8192.
|
|
PROGRAM
|
(PARI) { for (n = 0, 15, if (n>2, a=a1*a2*a3; a3=a2; a2=a1; a1=a, if (n==0, a=a3=1; a1=a2=2, a=2)); write("b063401.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 20 2009]
|
|
CROSSREFS
|
Cf. A000301, A000308.
Sequence in context: A032318 A090753 A091788 this_sequence A165420 A129614 A070283
Adjacent sequences: A063398 A063399 A063400 this_sequence A063402 A063403 A063404
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Henry Bottomley (se16(AT)btinternet.com), Jul 16 2001
|
|
EXTENSIONS
|
Definition corrected to a(1)=2, by Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 20 2009
|
|
|
Search completed in 0.002 seconds
|
