a(n) = 159*2^n - 222 (n>=1).

Terms

a(0) =96a(1) =414a(2) =1050a(3) =2322a(4) =4866a(5) =9954a(6) =20130a(7) =40482a(8) =81186a(9) =162594a(10) =325410a(11) =651042a(12) =1302306a(13) =2604834a(14) =5209890a(15) =10420002a(16) =20840226a(17) =41680674a(18) =83361570a(19) =166723362a(20) =333446946a(21) =666894114a(22) =1333788450a(23) =2667577122a(24) =5335154466a(25) =10670309154a(26) =21340618530a(27) =42681237282a(28) =85362474786a(29) =170724949794