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 A096854 #14 Jun 04 2024 01:26:27
%S A096854 1,3,12,15,72,91,312,255,1240,1860,4123,5080,26208,34200,93600,65535,
%T A096854 334368,416560,1420800,1596364,6146800,5949696,20485332,23788842,
%U A096854 120519630,194016600,358132380,458803800,1674738000,2166798816,6045990912,4294967295,22739738112,37862623140
%N A096854 a(n) = A062402(2^n-1).
%H A096854 Amiram Eldar, <a href="/A096854/b096854.txt">Table of n, a(n) for n = 1..400</a>
%F A096854 a(n) = A000203(A053287(n)). - _Amiram Eldar_, Jun 04 2024
%t A096854 Table[DivisorSigma[1, EulerPhi[2^n - 1]], {n, 1, 30}]
%o A096854 (PARI) a(n) = sigma(eulerphi(2^n-1)); \\ _Michel Marcus_, Aug 30 2019
%Y A096854 Cf. A000203, A053287, A062401, A062402, A053287, A096853, A096854, A096855, A096856.
%K A096854 nonn
%O A096854 1,2
%A A096854 _Labos Elemer_, Jul 19 2004
%E A096854 More terms from _Michel Marcus_, Aug 30 2019