a(n) = 424*2^n + 37.

Terms

a(0) =461a(1) =885a(2) =1733a(3) =3429a(4) =6821a(5) =13605a(6) =27173a(7) =54309a(8) =108581a(9) =217125a(10) =434213a(11) =868389a(12) =1736741a(13) =3473445a(14) =6946853a(15) =13893669a(16) =27787301a(17) =55574565a(18) =111149093a(19) =222298149a(20) =444596261a(21) =889192485a(22) =1778384933a(23) =3556769829a(24) =7113539621a(25) =14227079205a(26) =28454158373a(27) =56908316709