RosettaCodeData/Task/Anonymous-recursion/PARI-GP/anonymous-recursion-1.parigp
2023-07-01 13:44:08 -04:00

4 lines
91 B
Text

Fib(n)={
my(F=(k,f)->if(k<2,k,f(k-1,f)+f(k-2,f)));
if(n<0,(-1)^(n+1),1)*F(abs(n),F)
};