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 A045830 #7 Mar 08 2020 04:49:52 %S A045830 0,0,0,2,3,0,0,0,0,0,0,6,4,0,0,0,0,0,0,6,12,0,0,0,0,0,0,8,0,0,0,0,0,0, %T A045830 0,12,15,0,0,0,0,0,0,6,12,0,0,0,0,0,0,12,12,0,0,0,0,0,0,18,0,0,0,0,0, %U A045830 0,0,6,24 %N A045830 a(n) = A005927(n)/2. %K A045830 nonn %O A045830 0,4 %A A045830 _N. J. A. Sloane_