Inverse Euler transform of the classical tribonacci numbers.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =3a(5) =4a(6) =8a(7) =13a(8) =23a(9) =38a(10) =68a(11) =114a(12) =201a(13) =343a(14) =600a(15) =1037a(16) =1817a(17) =3157a(18) =5543a(19) =9692a(20) =17047a(21) =29952a(22) =52828a(23) =93157a(24) =164743a(25) =291459a(26) =516679a(27) =916626a(28) =1628684a(29) =2896261