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 A283224 #13 Mar 04 2017 11:43:41
%S A283224 1,5,23,90,317,1036,3192,9358,26336,71542,188440,483007,1208275,
%T A283224 2956941,7093531,16709523,38706389,88281394,198474497,440263342,
%U A283224 964424210,2087882510,4470194335,9471079495,19868723042,41291454537,85049747913,173697766646
%N A283224 Expansion of exp( Sum_{n>=1} sigma_2(2*n)*x^n/n ) in powers of x.
%H A283224 Seiichi Manyama, <a href="/A283224/b283224.txt">Table of n, a(n) for n = 0..1000</a>
%F A283224 a(n) = (1/n)*Sum_{k=1..n} sigma_2(2*k)*a(n-k). - _Seiichi Manyama_, Mar 04 2017
%Y A283224 Cf. exp( Sum_{n>=1} sigma_k(2*n)*x^n/n ): A182818 (k=1), this sequence (k=2).
%Y A283224 Cf. exp( Sum_{n>=1} sigma_2(m*n)*x^n/n ): A000219 (m=1), this sequence (m=2), A283238 (m=3).
%K A283224 nonn
%O A283224 0,2
%A A283224 _Seiichi Manyama_, Mar 03 2017