a(n) = binomial(Fibonacci(n) + 1, 2).

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =6a(5) =15a(6) =36a(7) =91a(8) =231a(9) =595a(10) =1540a(11) =4005a(12) =10440a(13) =27261a(14) =71253a(15) =186355a(16) =487578a(17) =1276003a(18) =3339820a(19) =8742471a(20) =22885995a(21) =59912931a(22) =156848616a(23) =410626153a(24) =1075018896a(25) =2814412825a(26) =7368190921a(27) =19290113571a(28) =50502074766a(29) =132215989335