Acil

f(1)=f(3)+1 ise f(3)=5
f(3)=f(5)+3 ise f(5)=2
f(5)=f(7)+5 ise f(7)=-3
f(7)=f(9)+7 ise f(9)=-12
f(9)=f(11)+9 ise f(11)=-21
f(11)=f(13)+11 ise f(13)=-32
f(13)=f(15)+13 ise f(15)=-45
f(15)=f(17)+15 ise f(17)=-60
f(17)=f(19)+17 ise f(19)=-77
f(19)=f(21)+19 ise f(21)=-96