a(n) = 14*2^n + 73.

Terms

a(0) =87a(1) =101a(2) =129a(3) =185a(4) =297a(5) =521a(6) =969a(7) =1865a(8) =3657a(9) =7241a(10) =14409a(11) =28745a(12) =57417a(13) =114761a(14) =229449a(15) =458825a(16) =917577a(17) =1835081a(18) =3670089a(19) =7340105a(20) =14680137a(21) =29360201a(22) =58720329a(23) =117440585a(24) =234881097a(25) =469762121a(26) =939524169a(27) =1879048265a(28) =3758096457a(29) =7516192841