The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A121253 a(n) = a(n-1)*a(n-3)+1 with a(0)=a(1)=a(2)=0. 1
 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; text; internal format)
 OFFSET 0,7 COMMENTS Analog of A007660 a(n)=a(n-1)*a(n-2)+1. What is the equivalent continued fraction and asymptotic representation? LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..26 (shortened by N. J. A. Sloane, Jan 13 2019) MATHEMATICA RecurrenceTable[{a[0]==a[1]==a[2]==0, a[n]==a[n-1]a[n-3]+1}, a, {n, 20}] (* Harvey P. Dale, Dec 30 2011 *) 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 CROSSREFS Cf. A007660. Sequence in context: A282571 A063455 A001144 * A014118 A007704 A328836 Adjacent sequences:  A121250 A121251 A121252 * A121254 A121255 A121256 KEYWORD nonn,easy AUTHOR Jonathan Vos Post, Aug 22 2006 EXTENSIONS More terms from Vincenzo Librandi, Nov 14 2011 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 27 18:27 EDT 2021. Contains 346308 sequences. (Running on oeis4.)