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A063401
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a(n)=a(n-1)*a(n-2)*a(n-3) with a(0)=1, a(1)=2, a(2)=2.
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3
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1, 2, 2, 4, 16, 128, 8192, 16777216, 17592186044416, 2417851639229258349412352, 713623846352979940529142984724747568191373312, 30354201441027016733116592294117482916287606860189680019559568902170379456331382784
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Current : 1,2,2,4,16,.. Expected: 1,1,2,2,4,16,.. [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 18 2009]
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LINKS
| Harry J. Smith, Table of n, a(n) for n=0,...,15
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FORMULA
| a(n) =2^A000073(n).
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EXAMPLE
| a(6)=128*16*4=8192.
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MATHEMATICA
| a0=1; a1=1; a2=2; lst={a0, a1, a2}; Do[AppendTo[lst, a=a0*a1*a2]; a0=a1; a1=a2; a2=a, {n, 12}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 18 2009]
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PROG
| (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]
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CROSSREFS
| Cf. A000301, A000308.
Sequence in context: A032318 A090753 A091788 * A168088 A168089 A171163
Adjacent sequences: A063398 A063399 A063400 * A063402 A063403 A063404
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KEYWORD
| nonn
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), Jul 16 2001
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EXTENSIONS
| Definition corrected to a(1)=2, by Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 20 2009
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