Nonhomogeneous three-term sequence a(n) = a(n-1) + a(n-2) + n.

Terms

a(0) =2a(1) =3a(2) =8a(3) =15a(4) =28a(5) =49a(6) =84a(7) =141a(8) =234a(9) =385a(10) =630a(11) =1027a(12) =1670a(13) =2711a(14) =4396a(15) =7123a(16) =11536a(17) =18677a(18) =30232a(19) =48929a(20) =79182a(21) =128133a(22) =207338a(23) =335495a(24) =542858a(25) =878379a(26) =1421264a(27) =2299671a(28) =3720964a(29) =6020665