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 A081862 #11 Dec 04 2013 06:30:11
%S A081862 0,13,465,4902,28483,115995,373503,1017498,2442492,5320665,10725680,
%T A081862 20266818,36330915,62292490,102677835,163765560,253797216,382977372,
%U A081862 565070697,817224746,1159251630,1617967923,2225268903,3015613812
%N A081862 (1/168)*(sigma_7(2n-1)-sigma_1(2n-1)).
%t A081862 Table[(DivisorSigma[7,n]-DivisorSigma[1,n])/168,{n,1,49,2}] (* _Harvey P. Dale_, Sep 17 2013 *)
%Y A081862 Cf. A000203, A081863(3).
%K A081862 nonn
%O A081862 1,2
%A A081862 _Benoit Cloitre_, Apr 11 2003