a(n) = floor(-(3/2)*a(n-1)), a(1)=-2.

Terms

a(0) =-2a(1) =3a(2) =-5a(3) =7a(4) =-11a(5) =16a(6) =-24a(7) =36a(8) =-54a(9) =81a(10) =-122a(11) =183a(12) =-275a(13) =412a(14) =-618a(15) =927a(16) =-1391a(17) =2086a(18) =-3129a(19) =4693a(20) =-7040a(21) =10560a(22) =-15840a(23) =23760a(24) =-35640a(25) =53460a(26) =-80190a(27) =120285a(28) =-180428a(29) =270642