a(n) = F(n) * (-1)^(n*(n-1)/2) where F(n) = A000045(n) Fibonacci numbers.

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-2a(4) =3a(5) =5a(6) =-8a(7) =-13a(8) =21a(9) =34a(10) =-55a(11) =-89a(12) =144a(13) =233a(14) =-377a(15) =-610a(16) =987a(17) =1597a(18) =-2584a(19) =-4181a(20) =6765a(21) =10946a(22) =-17711a(23) =-28657a(24) =46368a(25) =75025a(26) =-121393a(27) =-196418a(28) =317811a(29) =514229