Product of tribonacci numbers: a(n) = A000073(n+2)*A000213(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =12a(4) =35a(5) =117a(6) =408a(7) =1364a(8) =4617a(9) =15645a(10) =52882a(11) =178920a(12) =605331a(13) =2047705a(14) =6927424a(15) =23435384a(16) =79281057a(17) =268206185a(18) =907335090a(19) =3069491988a(20) =10384017875a(21) =35128880685a(22) =118840150776a(23) =402033352684