A Jacobsthal Fibonacci product.

Terms

a(0) =1a(1) =0a(2) =4a(3) =6a(4) =30a(5) =80a(6) =286a(7) =882a(8) =2924a(9) =9350a(10) =30438a(11) =98208a(12) =318278a(13) =1029210a(14) =3331820a(15) =10780014a(16) =34888062a(17) =112894960a(18) =365344142a(19) =1182264930a(20) =3825911596a(21) =12380874550a(22) =40065409014a(23) =129654294336a(24) =419570260150