a(n) = Fibonacci(n) * (Fibonacci(n+2) - 1).

Terms

a(0) =1a(1) =2a(2) =8a(3) =21a(4) =60a(5) =160a(6) =429a(7) =1134a(8) =2992a(9) =7865a(10) =20648a(11) =54144a(12) =141897a(13) =371722a(14) =973560a(15) =2549421a(16) =6675460a(17) =17478176a(18) =45761045a(19) =119808150a(20) =313668576a(21) =821205937a(22) =2149962768a(23) =5628704256a(24) =14736185425a(25) =38579909330a(26) =101003635304