a(n) = 3*a(n-1) - 7*a(n-2), with a(0)=0, a(1)=1.

Terms

a(0) =0a(1) =1a(2) =3a(3) =2a(4) =-15a(5) =-59a(6) =-72a(7) =197a(8) =1095a(9) =1906a(10) =-1947a(11) =-19183a(12) =-43920a(13) =2521a(14) =315003a(15) =927362a(16) =577065a(17) =-4760339a(18) =-18320472a(19) =-21639043a(20) =63326175a(21) =341451826a(22) =581072253a(23) =-646946023a(24) =-6008343840a(25) =-13496409359a(26) =1569178803a(27) =99182401922a(28) =286562954145a(29) =165412048981