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 A283238 #13 Mar 04 2017 11:42:33
%S A283238 1,10,75,447,2335,10977,47667,193775,745819,2738568,9653342,32821384,
%T A283238 108061167,345622069,1076767956,3275039352,9743874779,28405248949,
%U A283238 81256123017,228383836091,631427595230,1718990010867,4612234492354,12206598044861,31889379237288
%N A283238 Expansion of exp( Sum_{n>=1} sigma_2(3*n)*x^n/n ) in powers of x.
%H A283238 Seiichi Manyama, <a href="/A283238/b283238.txt">Table of n, a(n) for n = 0..1000</a>
%F A283238 a(n) = (1/n)*Sum_{k=1..n} sigma_2(3*k)*a(n-k). - _Seiichi Manyama_, Mar 04 2017
%Y A283238 Cf. exp( Sum_{n>=1} sigma_k(3*n)*x^n/n ): A182819 (k=1), this sequence (k=2).
%Y A283238 Cf. exp( Sum_{n>=1} sigma_2(m*n)*x^n/n ): A000219 (m=1), A283224 (m=2), this sequence (m=3).
%K A283238 nonn
%O A283238 0,2
%A A283238 _Seiichi Manyama_, Mar 03 2017