Partial sums of tetranacci numbers (A000288).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =8a(5) =15a(6) =28a(7) =53a(8) =102a(9) =196a(10) =377a(11) =726a(12) =1399a(13) =2696a(14) =5196a(15) =10015a(16) =19304a(17) =37209a(18) =71722a(19) =138248a(20) =266481a(21) =513658a(22) =990107a(23) =1908492a(24) =3678736a(25) =7090991a(26) =13668324a(27) =26346541a(28) =50784590a(29) =97890444