a(n) = Fibonacci(n) * Fibonacci(2*n).

Terms

a(0) =0a(1) =1a(2) =3a(3) =16a(4) =63a(5) =275a(6) =1152a(7) =4901a(8) =20727a(9) =87856a(10) =372075a(11) =1576279a(12) =6676992a(13) =28284569a(14) =119814747a(15) =507544400a(16) =2149990983a(17) =9107510539a(18) =38580029568a(19) =163427634589a(20) =692290558575