Product of Fibonacci and tribonacci numbers: a(n) = A000045(n+1)*A000073(n+2).

Terms

a(0) =1a(1) =1a(2) =4a(3) =12a(4) =35a(5) =104a(6) =312a(7) =924a(8) =2754a(9) =8195a(10) =24386a(11) =72576a(12) =215991a(13) =642785a(14) =1912960a(15) =5693016a(16) =16942573a(17) =50421592a(18) =150056090a(19) =446571180a(20) =1329008590a(21) =3955167387a(22) =11770690808a(23) =35029911168a(24) =104250013425a(25) =310251009501a(26) =923315841860