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 A331760 #11 Aug 17 2021 02:17:55
%S A331760 2,20,83,237,534,1054,1892,3114,4880,7327,10530,14730,20066,26689,
%T A331760 34882,44902,56850,70946,87644,106986,129470,155457,184920,218596,
%U A331760 256675,299292,347261,400590,459615,525217,597887,677507,764657,860340,964291,1077693,1201321
%N A331760 a(n) = A115004(2n)/4.
%H A331760 Chai Wah Wu, <a href="/A331760/b331760.txt">Table of n, a(n) for n = 1..10000</a>
%H A331760 N. J. A. Sloane, <a href="/A115004/a115004.txt">Families of Essentially Identical Sequences</a>, Mar 24 2021 (Includes this sequence)
%F A331760 a(n) = n^2 + (Sum_{i=2..2n} (2*n+1-i)*(4*n+2-i)*phi(i))/4. - _Chai Wah Wu_, Aug 17 2021
%o A331760 (Python)
%o A331760 from sympy import totient
%o A331760 def A331760(n): return n**2 + sum(totient(i)*(2*n+1-i)*(4*n+2-i) for i in range(2,2*n+1))//4 # _Chai Wah Wu_, Aug 17 2021
%Y A331760 Cf. A115004, A331759.
%K A331760 nonn
%O A331760 1,1
%A A331760 _N. J. A. Sloane_, Feb 04 2020