Inverse Euler transform of the tribonacci numbers A000073.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =6a(7) =10a(8) =18a(9) =31a(10) =56a(11) =96a(12) =172a(13) =299a(14) =530a(15) =929a(16) =1646a(17) =2893a(18) =5126a(19) =9044a(20) =16028a(21) =28362a(22) =50328a(23) =89249a(24) =158598a(25) =281830a(26) =501538a(27) =892857a(28) =1591282a(29) =2837467