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 A050450 #6 Jun 17 2013 18:35:46
%S A050450 1,1,1,1,26,1,1,1,82,26,1,1,170,1,26,1,290,82,1,26,442,1,1,1,651,170,
%T A050450 82,1,842,26,1,1,1090,290,26,82,1370,1,170,26,1682,442,1,1,2132,1,1,1,
%U A050450 2402,651,290,170,2810,82,26,1,3250,842,1,26,3722,1
%N A050450 Sum_{d|n, d=1 mod 4} d^2.
%H A050450 Reinhard Zumkeller, <a href="/A050450/b050450.txt">Table of n, a(n) for n = 1..10000</a>
%o A050450 (Haskell)
%o A050450 a050450 = sum . map (^ 2) . filter ((== 1) . (`mod` 4)) . a027750_row
%o A050450 -- _Reinhard Zumkeller_, Jun 17 2013
%Y A050450 Cf. A027750, A050453.
%K A050450 nonn
%O A050450 1,5
%A A050450 _N. J. A. Sloane_, Dec 23 1999