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 A283369 #38 Mar 17 2017 10:34:49
%S A283369 1,513,1594324,17179869697,476837158203126,28430288029931296212,
%T A283369 3219905755813179726837608,633825300114114700765531472385,
%U A283369 202755595904452569706561330874548093,100000000000000000000000000476837158203638
%N A283369 a(n) = Sum_{d|n} d^(4*d + 1).
%H A283369 Seiichi Manyama, <a href="/A283369/b283369.txt">Table of n, a(n) for n = 1..119</a>
%e A283369 a(6) = 1^(4+1) + 2^(8+1) + 3^(12+1) + 6^(24+1) = 28430288029931296212.
%t A283369 Table[Sum[d^(4*d + 1), {d, Divisors[n]}], {n, 20}] (* _Indranil Ghosh_, Mar 17 2017 *)
%o A283369 (PARI) for(n=1, 20, print1(sumdiv(n, d, d^(4*d + 1)),", ")) \\ _Indranil Ghosh_, Mar 17 2017
%Y A283369 Cf. Sum_{d|n} d^(k*d+1): A283498 (k=1), A283533 (k=2), A283535 (k=3), this sequence (k=4).
%K A283369 nonn
%O A283369 1,2
%A A283369 _Seiichi Manyama_, Mar 17 2017