This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A141520 a(1) = 0, a(2) = a(3) = 1; a(n) = a(n-1)*a(n-2) + a(n-2)*a(n-3) for n > 3. 1
 0, 1, 1, 1, 2, 3, 8, 30, 264, 8160, 2162160, 17645379840, 38152152118080000, 673209215875134265982054400, 25684380411361480419900838705211915059200000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 REFERENCES Martin Gardner, Mathematical Circus, Random House, New York, 1981, p. 165. LINKS Michael De Vlieger, Table of n, a(n) for n = 1..21 MATHEMATICA t={0, 1, 1}; Do[AppendTo[t, t[[-3]]*t[[-2]]+t[[-2]]*t[[-1]]], {n, 13}]; t (* Vladimir Joseph Stephan Orlovsky, Feb 03 2012 *) Nest[Append[#, #[[-1]] #[[-2]] + #[[-2]] #[[-3]]] &, {0, 1, 1}, 12] (* Michael De Vlieger, Dec 17 2017 *) PROG (MATLAB) function y=fib(n) %Generates running geometric numbers fz(1)=0; fz(2)=1; fz(3)=1; for k=4:n fz(k)=fz(k-2)*(fz(k-1)+fz(k-3)); end y=fz(n); CROSSREFS Sequence in context: A054104 A053556 A001048 * A072042 A160586 A162074 Adjacent sequences:  A141517 A141518 A141519 * A141521 A141522 A141523 KEYWORD nonn AUTHOR Matt Wynne (matwyn(AT)verizon.net), Aug 11 2008 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 19 09:34 EST 2018. Contains 299330 sequences. (Running on oeis4.)