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 A096856 #12 Jun 04 2024 01:26:12
%S A096856 1,3,7,12,31,42,124,224,511,847,1953,2688,12264,18816,29127,72540,
%T A096856 131071,195048,558523,1077440,3164112,4552020,10890040,10342080,
%U A096856 54525848,73260781,155671040,318848400,1080311232,964580240,3070642080,4340711424,13722819600,19039027200
%N A096856 a(n) = A062402(2^n+1).
%H A096856 Amiram Eldar, <a href="/A096856/b096856.txt">Table of n, a(n) for n = 0..372</a>
%F A096856 a(n) = A000203(A053285(n)). - _Amiram Eldar_, Jun 04 2024
%t A096856 Table[DivisorSigma[1, EulerPhi[2^n + 1]], {n, 0, 30}]
%Y A096856 Cf. A000203, A053285, A062401, A062402, A053287, A096853, A096854, A096855.
%K A096856 nonn
%O A096856 0,2
%A A096856 _Labos Elemer_, Jul 19 2004
%E A096856 Offset changed to 0, a(0) prepended and three more terms added by _Amiram Eldar_, Jun 04 2024