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 A092341 #11 Dec 12 2023 08:00:50
%S A092341 1,28,252,757,2044,3528,6813,9632,16380,20440,31752,37296,55261,61544,
%T A092341 86688,95382,131068,137592,183960,192080,257544,260408,335664,340704,
%U A092341 442845,441028,553896,551881,703136,682920,858438,834176,1048572,1008324,1238328,1213632
%N A092341 a(0)=1, a(n) = sigma_3(3n).
%F A092341 Sum_{k=1..n} a(k) ~ (83*zeta(4)/12) * n^4. - _Amiram Eldar_, Dec 12 2023
%t A092341 Join[{1},DivisorSigma[3,3*Range[40]]] (* _Harvey P. Dale_, Feb 02 2012 *)
%o A092341 (PARI) a(n) = if(n < 1, 1, sigma(3*n, 3)); \\ _Amiram Eldar_, Dec 12 2023
%Y A092341 Trisection of A001158.
%Y A092341 Cf. A013662, A045823, A091986, A092342, A092343.
%K A092341 nonn,easy
%O A092341 0,2
%A A092341 _N. J. A. Sloane_, Mar 20 2004