a(n) = A000045[n]*(A004001[n + 1] - 2*A004001[n] + A004001[n - 1]).

Terms

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