Sum of Fibonacci and tribonacci numbers: a(n) = A000073(n) + A000045(n).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =9a(6) =15a(7) =26a(8) =45a(9) =78a(10) =136a(11) =238a(12) =418a(13) =737a(14) =1304a(15) =2315a(16) =4123a(17) =7365a(18) =13193a(19) =23694a(20) =42655a(21) =76958a(22) =139126a(23) =251974a(24) =457112a(25) =830501a(26) =1510930a(27) =2752175a(28) =5018581a(29) =9160293