Convolve Fibonacci and Pell numbers.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =9a(5) =24a(6) =62a(7) =156a(8) =387a(9) =951a(10) =2323a(11) =5652a(12) =13716a(13) =33228a(14) =80405a(15) =194415a(16) =469845a(17) =1135092a(18) =2741626a(19) =6620928a(20) =15987663a(21) =38603019a(22) =93204647a(23) =225030024a(24) =543293352a(25) =1311663096a(26) =3166694569a(27) =7645173627a(28) =18457238241a(29) =44559967920