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 A078158 #12 Jun 18 2025 21:29:49
%S A078158 0,0,0,8,24,73,183,470,1112,2592,5876,13233,29316,64329,140028,302824,
%T A078158 651101,1393204,2968129,6300084,13326815,28108564,59123162,124065274,
%U A078158 259759346,542781169,1132075405,2357197804,4900443545,10173068455,21090365684
%N A078158 a(n) = A078153(2^n).
%t A078158 Table[ Apply[ Plus, Union[ Table[ Floor[2^w/j], {j, 1, 2^w}]]] - DivisorSigma[1, 2^w], {w, 1, 24}]
%Y A078158 Cf. A078152, A078153, A078154, A078155, A078156, A078157.
%K A078158 nonn
%O A078158 1,4
%A A078158 _Labos Elemer_, Nov 27 2002
%E A078158 Extended by _Robert G. Wilson v_, Dec 02 2002
%E A078158 Terms a(26) onward from _Max Alekseyev_, Feb 12 2012