a(n) = Sum_{i = 0..floor(n/2)} (-1)^(i + floor(n/2)) F(2*i + e), where F = A000045 (Fibonacci numbers) and e = (1-(-1)^n)/2.

A074677

a(n) = Sum_{i = 0..floor(n/2)} (-1)^(i + floor(n/2)) F(2*i + e), where F = A000045 (Fibonacci numbers) and e = (1-(-1)^n)/2.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =6a(7) =9a(8) =15a(9) =25a(10) =40a(11) =64a(12) =104a(13) =169a(14) =273a(15) =441a(16) =714a(17) =1156a(18) =1870a(19) =3025a(20) =4895a(21) =7921a(22) =12816a(23) =20736a(24) =33552a(25) =54289a(26) =87841a(27) =142129a(28) =229970a(29) =372100

External references