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 A306897 #16 Nov 24 2021 05:24:25
%S A306897 0,1,1,4,5,14,21,48,87,180,341,704,1365,2758,5475,10976,21845,43806,
%T A306897 87381,174960,349573,699402,1398101,2797008,5592425,11186188,22369797,
%U A306897 44742040,89478485,178962840,357913941,715838912,1431656457,2863333392,5726623175,11453291400,22906492245,45813071890
%N A306897 a(n) = A306896(n)/6.
%H A306897 Michael De Vlieger, <a href="/A306897/b306897.txt">Table of n, a(n) for n = 1..3324</a>
%H A306897 Silvana Ramaj, <a href="https://digitalcommons.georgiasouthern.edu/cgi/viewcontent.cgi?article=3464&context=etd">New Results on Cyclic Compositions and Multicompositions</a>, Master's Thesis, Georgia Southern Univ., 2021. See p. 48.
%t A306897 Table[DivisorSum[n, (2^# + 2 (-1)^#) EulerPhi[n/#] &]/6, {n, 38}] (* _Michael De Vlieger_, Mar 18 2019 *)
%o A306897 (PARI) a(n) = sumdiv(n, d, (2^d + 2*(-1)^d)*eulerphi(n/d))/6; \\ _Michel Marcus_, Mar 16 2019
%Y A306897 Cf. A306896.
%K A306897 nonn
%O A306897 1,4
%A A306897 _Michael De Vlieger_ and _N. J. A. Sloane_, Mar 15 2019