A product of consecutive doubled Fibonacci numbers.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =25a(6) =65a(7) =169a(8) =442a(9) =1156a(10) =3026a(11) =7921a(12) =20737a(13) =54289a(14) =142130a(15) =372100a(16) =974170a(17) =2550409a(18) =6677057a(19) =17480761a(20) =45765226a(21) =119814916a(22) =313679522a(23) =821223649a(24) =2149991425a(25) =5628750625a(26) =14736260450a(27) =38580030724a(28) =101003831722