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

Terms

a(0) =2a(1) =-3a(2) =3a(3) =22a(4) =51a(5) =93a(6) =170a(7) =333a(8) =675a(9) =1366a(10) =2739a(11) =5469a(12) =10922a(13) =21837a(14) =43683a(15) =87382a(16) =174771a(17) =349533a(18) =699050a(19) =1398093a(20) =2796195a(21) =5592406a(22) =11184819a(23) =22369629a(24) =44739242a(25) =89478477a(26) =178956963a(27) =357913942a(28) =715827891a(29) =1431655773