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 A323364 #9 Jan 13 2019 19:29:01 %S A323364 2,0,0,9,0,24,0,9,16,36,0,12,0,48,48,27,0,24,0,18,64,72,0,60,36,84,32, %T A323364 24,0,0,0,45,96,108,96,84,0,120,112,90,0,0,0,36,48,144,0,84,64,72,144, %U A323364 42,0,120,144,120,160,180,0,216,0,192,64,99,168,0,0,54,192,0,0,132,0,228,96,60,192,0,0,126,112,252,0,288,216,264,240,180,0 %N A323364 Sum of Dedekind's psi, A001615, and its Dirichlet inverse, A323363. %H A323364 Antti Karttunen, <a href="/A323364/b323364.txt">Table of n, a(n) for n = 1..16384</a> %o A323364 (PARI) %o A323364 A001615(n) = (n * sumdivmult(n, d, issquarefree(d)/d)); \\ From A001615 %o A323364 A323363(n) = if(1==n,1,-sumdiv(n,d,if(d<n,A001615(n/d)*A323363(d),0))); %o A323364 A323364(n) = (A001615(n) + A323363(n)); %Y A323364 Cf. A001615, A323363. %Y A323364 Cf. also A319340, A322581, A323365, A323372, A323399. %K A323364 nonn %O A323364 1,1 %A A323364 _Antti Karttunen_, Jan 13 2019