a(n) = b(n) - c(n) where b(n) = [ (3/2)^n ] and c(n) is the n-th number not in sequence b.

Terms

a(0) =-3a(1) =-4a(2) =-5a(3) =-4a(4) =-3a(5) =-1a(6) =4a(7) =11a(8) =23a(9) =41a(10) =68a(11) =110a(12) =174a(13) =270a(14) =415a(15) =633a(16) =961a(17) =1451a(18) =2189a(19) =3297a(20) =4958a(21) =7451a(22) =11191a(23) =16802a(24) =25218a(25) =37842a(26) =56780a(27) =85186a(28) =127797a(29) =191712