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A121253
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a(n) = a(n-1)*a(n-3)+1 with a(0)=a(1)=a(2)=0.
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1
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0, 0, 0, 1, 1, 1, 2, 3, 4, 9, 28, 113, 1018, 28505, 3221066, 3279045189, 93469183112446, 301070407771273987437, 987223472152664180906141290594, 92274971491542102812339702600558728264132925
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,7
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COMMENTS
| Analogue of A007660 a(n)=a(n-1)*a(n-2)+1. What is the equivalent continued fraction and asymptotic representation?
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..30
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MATHEMATICA
| RecurrenceTable[{a[0]==a[1]==a[2]==0, a[n]==a[n-1]a[n-3]+1}, a, {n, 20}] (* From Harvey P. Dale, Dec 30 2011 *)
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PROG
| (MAGMA) I:=[0, 0, 0]; [n le 3 select I[n] else Self(n-1)*Self(n-3)+1: n in [1..20]]; // Vincenzo Librandi, Nov 14 2011
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CROSSREFS
| Cf. A007660.
Sequence in context: A076381 A063455 A001144 * A014118 A007704 A059972
Adjacent sequences: A121250 A121251 A121252 * A121254 A121255 A121256
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KEYWORD
| nonn,easy
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 22 2006
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EXTENSIONS
| More terms from Vincenzo Librandi, Nov 14 2011
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