Inverse Moebius transform of tribonacci numbers (A000073).

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =4a(5) =9a(6) =13a(7) =27a(8) =45a(9) =86a(10) =149a(11) =285a(12) =504a(13) =941a(14) =1710a(15) =3163a(16) =5768a(17) =10662a(18) =19513a(19) =35978a(20) =66026a(21) =121565a(22) =223317a(23) =411053a(24) =755480a(25) =1390042a(26) =2555802a(27) =4701713a(28) =8646064a(29) =15904390