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 A280252 #23 Jan 05 2024 01:50:42
%S A280252 2,8,12,24,20,48,42,80,72,120,110,168,130,196,150,256,238,396,266,440,
%T A280252 336,572,368,624,400,728,540,728,638,900,682,960,726,1224,910,1512,
%U A280252 1036,1520,1014,1600,1066,1848,1204,2024,1530,2116,1598,2304,1666,2500,1836,2704
%N A280252 Sum of the parts in the partitions of 2n into two squarefree parts.
%H A280252 <a href="/index/Par#part">Index entries for sequences related to partitions</a>
%F A280252 a(n) = 2*n * A280226(n).
%F A280252 a(n) = A280250(n) + A280251(n).
%p A280252 with(numtheory): A280252:=n->2*n*add(mobius(i)^2*mobius(2*n-i)^2, i=1..n): seq(A280252(n), n=1..100);
%t A280252 Table[2 n*Sum[MoebiusMu[i]^2 MoebiusMu[2 n - i]^2, {i, n}], {n, 80}] (* _Wesley Ivan Hurt_, Jan 05 2024 *)
%Y A280252 Cf. A008683, A226237, A280226, A280250, A280251.
%K A280252 nonn,easy
%O A280252 1,1
%A A280252 _Wesley Ivan Hurt_, Dec 29 2016