a(n) = sum of n Fibonacci numbers starting from F(n).

Terms

a(0) =0a(1) =1a(2) =3a(3) =10a(4) =29a(5) =81a(6) =220a(7) =589a(8) =1563a(9) =4126a(10) =10857a(11) =28513a(12) =74792a(13) =196041a(14) =513619a(15) =1345282a(16) =3522981a(17) =9224881a(18) =24153636a(19) =63239221a(20) =165569195a(21) =433476726a(22) =1134874513a(23) =2971168705a(24) =7778667024a(25) =20364889681a(26) =53316094755a(27) =139583544634