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A141520
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a(n)=a(n-1)*a(n-2)+a(n-2)*a(n-3).
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0
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0, 1, 1, 1, 2, 3, 8, 30, 264, 8160, 2162160, 17645379840, 38152152118080000, 673209215875134265982054400, 25684380411361480419900838705211915059200000
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OFFSET
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1,5
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REFERENCES
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Martin Gardner, Mathematical Circus,Randon House, New York, 1981,p 165
http://math.fullerton.edu/mathews/software/Matlab2004.zip
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LINKS
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Table of n, a(n) for n=1..15.
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MATHEMATICA
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t={0, 1, 1}; Do[AppendTo[t, t[[-3]]*t[[-2]]+t[[-2]]*t[[-1]]], {n, 13}]; t (* From Vladimir Joseph Stephan Orlovsky, Feb 03 2012 *)
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PROG
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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);
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CROSSREFS
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Sequence in context: A054104 A053556 A001048 * A072042 A160586 A162074
Adjacent sequences: A141517 A141518 A141519 * A141521 A141522 A141523
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KEYWORD
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nonn
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AUTHOR
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Matt Wynne (matwyn(AT)verizon.net), Aug 11 2008
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STATUS
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approved
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