p-INVERT of the (3^n), where p(S) = 1 - S - S^2.

Terms

a(0) =1a(1) =5a(2) =24a(3) =113a(4) =527a(5) =2446a(6) =11325a(7) =52369a(8) =242008a(9) =1117997a(10) =5163891a(11) =23849270a(12) =110142089a(13) =508652653a(14) =2349005592a(15) =10847859961a(16) =50095958215a(17) =231345247934