Partial sums of A000016.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =11a(6) =17a(7) =27a(8) =43a(9) =73a(10) =125a(11) =219a(12) =391a(13) =707a(14) =1293a(15) =2389a(16) =4437a(17) =8293a(18) =15579a(19) =29377a(20) =55593a(21) =105533a(22) =200859a(23) =383221a(24) =732757a(25) =1403849a(26) =2694405a(27) =5179939a(28) =9973431a(29) =19229827