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 A283237 #19 Dec 12 2023 08:00:57
%S A283237 10,50,91,210,260,455,500,850,820,1300,1220,1911,1700,2500,2366,3410,
%T A283237 2900,4100,3620,5460,4550,6100,5300,7735,6510,8500,7381,10500,8420,
%U A283237 11830,9620,13650,11102,14500,13000,17220,13700,18100,15470,22100,16820,22750,18500
%N A283237 a(n) = sigma_2(3*n).
%H A283237 Seiichi Manyama, <a href="/A283237/b283237.txt">Table of n, a(n) for n = 1..10000</a>
%F A283237 a(n) = A001157(3*n).
%F A283237 Sum_{k=1..n} a(k) ~ (29*zeta(3)/9) * n^3. - _Amiram Eldar_, Dec 12 2023
%t A283237 Table[DivisorSigma[2,3n],{n,1,43}] (* _Indranil Ghosh_, Mar 03 2017 *)
%o A283237 (PARI) a(n) = sigma(3*n,2); \\ _Indranil Ghosh_, Mar 03 2017
%Y A283237 Sigma_2(k*n): A001157 (k=1), A099979 (k=2), this sequence (k=3).
%Y A283237 Cf. A002117.
%K A283237 nonn,easy
%O A283237 1,1
%A A283237 _Seiichi Manyama_, Mar 03 2017