a(n) = 5*a(n-1) - 10*a(n-2) + 8*a(n-3) with a(0) = 2, a(1) = a(2) = 3.

Terms

a(0) =2a(1) =3a(2) =3a(3) =1a(4) =-1a(5) =9a(6) =63a(7) =217a(8) =527a(9) =969a(10) =1311a(11) =1081a(12) =47a(13) =-87a(14) =7743a(15) =39961a(16) =121679a(17) =270729a(18) =456543a(19) =548857a(20) =344687a(21) =-112791a(22) =380031a(23) =5785561a(24) =24225167a(25) =66310473a(26) =135585183a(27) =208622521a(28) =217744559a(29) =87179049