This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A141083 #15 Feb 19 2021 05:55:41
%S A141083 2,12,240,4032,1047552,16773120,4294901760,68719214592,17592181850112,
%T A141083 72057593769492480,1152921503533105152,4722366482800925736960,
%U A141083 1208925819613529663078400,19342813113829668748787712
%N A141083 a(n) = 2^(p - 2)*(2^p - 2), where p = prime(n).
%F A141083 a(n) = A020522(prime(n)-1). - _Michel Marcus_, Feb 18 2021
%e A141083 Prime(1)=2, so a(1) = 2^(2 - 2)*(2^2 - 2) = 2^0*(4-2) = 2.
%e A141083 Prime(2)=3, so a(2) = 2^(3 - 2)*(2^3 - 2) = 2^1*(8-2) = 12.
%t A141083 Table[2^(n-2) (2^n-2),{n,Prime[Range[20]]}] (* _Harvey P. Dale_, Aug 19 2014 *)
%Y A141083 Cf. A020522.
%K A141083 nonn
%O A141083 1,1
%A A141083 _Juri-Stepan Gerasimov_, Aug 05 2008
%E A141083 Corrected and extended by _D. S. McNeil_, Mar 21 2009