a(n) = 2^n - 81.

Terms

a(0) =-80a(1) =-79a(2) =-77a(3) =-73a(4) =-65a(5) =-49a(6) =-17a(7) =47a(8) =175a(9) =431a(10) =943a(11) =1967a(12) =4015a(13) =8111a(14) =16303a(15) =32687a(16) =65455a(17) =130991a(18) =262063a(19) =524207a(20) =1048495a(21) =2097071a(22) =4194223a(23) =8388527a(24) =16777135a(25) =33554351a(26) =67108783a(27) =134217647a(28) =268435375a(29) =536870831