a(n) = 5*a(n-1) - 9*a(n-2), with a(0)=0, a(1)=1.

Terms

a(0) =0a(1) =1a(2) =5a(3) =16a(4) =35a(5) =31a(6) =-160a(7) =-1079a(8) =-3955a(9) =-10064a(10) =-14725a(11) =16951a(12) =217280a(13) =933841a(14) =2713685a(15) =5163856a(16) =1396115a(17) =-39494129a(18) =-210035680a(19) =-694731239a(20) =-1583335075a(21) =-1664094224a(22) =5929544555a(23) =44624570791a(24) =169756952960a(25) =447163627681a(26) =708005561765a(27) =-484444840304