Jacobsthal(n)*Fibonacci(n-1).

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =10a(5) =33a(6) =105a(7) =344a(8) =1105a(9) =3591a(10) =11594a(11) =37565a(12) =121485a(13) =393264a(14) =1272413a(15) =4117971a(16) =13325450a(17) =43123017a(18) =139547457a(19) =451587592a(20) =1461364025a(21) =4729080015a(22) =15303613546a(23) =49523551333a(24) =160261550085a(25) =518617316448