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Search: id:A063402
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| A063402 |
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a(0)=0; a(1)=1; a(2)=2; a(n)= a(n-1) + a(n-2)*a(n-3). |
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+0
1
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| 0, 1, 2, 2, 4, 8, 16, 48, 176, 944, 9392, 175536, 9041584, 1657675696, 1588781164720, 14989602831307184, 2633698912621747952304, 23815201278713350097371300784, 39478100701260806183512640492975852720
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,29
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PROGRAM
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(PARI) { for (n = 0, 29, if (n>2, a=a1 + a2*a3; a3=a2; a2=a1; a1=a, if (n==0, a=a3=0; a2=1; a1=2, if (n==1, a=1, a=2))); write("b063402.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 20 2009]
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CROSSREFS
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Cf. A006888.
Sequence in context: A123593 A122748 A108774 this_sequence A139800 A007971 A126068
Adjacent sequences: A063399 A063400 A063401 this_sequence A063403 A063404 A063405
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KEYWORD
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nonn,easy
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AUTHOR
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Olivier Gerard (olivier.gerard(AT)gmail.com), Jul 16 2001.
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