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A141520 a(n)=a(n-1)*a(n-2)+a(n-2)*a(n-3). 0
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,Randon House, New York, 1981,p 165

http://math.fullerton.edu/mathews/software/Matlab2004.zip

LINKS

Table of n, a(n) for n=1..15.

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 *)

PROG

MatLab program:

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

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Last modified November 28 15:24 EST 2014. Contains 250363 sequences.