Numerator of (2^n - 2)/n.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =6a(5) =31a(6) =18a(7) =127a(8) =170a(9) =511a(10) =186a(11) =2047a(12) =630a(13) =8191a(14) =10922a(15) =32767a(16) =7710a(17) =131071a(18) =27594a(19) =524287a(20) =699050a(21) =2097151a(22) =364722a(23) =8388607a(24) =6710886a(25) =33554431a(26) =44739242a(27) =19173961a(28) =18512790a(29) =536870911