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 A038779 #22 Feb 14 2021 04:42:33
%S A038779 10,70,700,104968,1398500,268439590,3817763740,799645010860,
%T A038779 2573485510942780,38430716856090160,131176846748288854980,
%U A038779 30223145490393217217464,460543169377106318541400,107646959937860684094362500,390046338531762979375904093800
%N A038779 An intermediate sequence for nonisomorphic circulant directed p^2-graphs, indexed by odd primes p.
%H A038779 M. Klin, V. A. Liskovets and R. Poeschel, <a href="http://www.mat.univie.ac.at/~slc/wpapers/s36klp.html">Analytical enumeration of circulant graphs with prime-squared vertices</a>, Sem. Lotharingien de Combin., B36d, 1996, 36 pages.
%F A038779 a(p^2) = A038778(p^2) - A038777(p^2) + A038780(p^2).
%F A038779 a(p^2) = (1/(p-1)) * Sum_{r|p-1} phi(r) * 2^(2*(p-1)/r). - _Sean A. Irvine_, Feb 14 2021
%o A038779 (PARI) a(n) = my(p=prime(n+1)); (1/(p-1)) * sumdiv(p-1, r, eulerphi(r) * 2^(2*(p-1)/r)); \\ _Michel Marcus_, Feb 14 2021
%Y A038779 Cf. A038777.
%K A038779 nonn,easy
%O A038779 1,1
%A A038779 _N. J. A. Sloane_, May 04 2000
%E A038779 More terms from _Valery A. Liskovets_, May 09 2001
%E A038779 More terms and offset corrected by _Sean A. Irvine_, Feb 14 2021