a(n) = 2^(n+23) - 23.

Terms

a(0) =8388585a(1) =16777193a(2) =33554409a(3) =67108841a(4) =134217705a(5) =268435433a(6) =536870889a(7) =1073741801a(8) =2147483625a(9) =4294967273a(10) =8589934569a(11) =17179869161a(12) =34359738345a(13) =68719476713a(14) =137438953449a(15) =274877906921a(16) =549755813865