a(n) = 101*2^(n-1) - 100.

Terms

a(0) =1a(1) =102a(2) =304a(3) =708a(4) =1516a(5) =3132a(6) =6364a(7) =12828a(8) =25756a(9) =51612a(10) =103324a(11) =206748a(12) =413596a(13) =827292a(14) =1654684a(15) =3309468a(16) =6619036a(17) =13238172a(18) =26476444a(19) =52952988a(20) =105906076a(21) =211812252a(22) =423624604a(23) =847249308a(24) =1694498716