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 A046950 #22 Jul 07 2025 20:20:34
%S A046950 1,25,49,169,625,1369,3025,7921,18769,37249,208849,3485689,4950625,
%T A046950 7756225,225150025,48195616225,264353307409,453673643809,
%U A046950 1278932548201,5225490897028249,6290436331177441,16712972707067569
%N A046950 Square elements of A046949.
%t A046950 Join[{1}, Table[ 24*Sum[ d*Mod[d, 2], {d, Divisors[n]}], {n, 1, 10^6}]] // Accumulate // Select[#, IntegerQ[Sqrt[#]] &] & (* _Jean-François Alcover_, Jul 02 2013 *)
%o A046950 (PARI) B=1; print1(B, ", "); for (n=1,200000,t1=divisors(2*n); t2=0; for (i=1, length(t1), if( t1[ i ]%4 <> 0, t2=t2+t1[ i ])); B=B+8*t2; if (issquare(B), print1(B, ", ")))
%Y A046950 Cf. A046949.
%K A046950 nonn,nice,more
%O A046950 0,2
%A A046950 _N. J. A. Sloane_
%E A046950 a(17)-a(18) from _Jason Earls_, Jul 21 2001
%E A046950 a(19)-a(21) from _Sean A. Irvine_, May 07 2021