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 A047804 #18 Feb 18 2023 07:30:10 %S A047804 1,432,186192,16881984 %N A047804 Duplicate of A008691. %C A047804 Original title: Theta series of Niemeier lattice of type D_10*E_7^2. %Y A047804 Cf. A008691. - _R. J. Mathar_, Oct 18 2008 %K A047804 dead %O A047804 0,2 %A A047804 _N. J. A. Sloane_