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 A274822 #11 Jul 10 2016 22:56:13 %S A274822 1,7,66 %N A274822 Total number of regions in all arrangements of n circles in the affine plane, including the regions that do not belong to the circles. %C A274822 Consider the arrangements of n circles described in A250001. %Y A274822 Row sums of triangle A274818. %Y A274822 For another version see A274823. %Y A274822 Cf. A250001, A274776. %K A274822 nonn,hard,bref,more %O A274822 1,2 %A A274822 _Omar E. Pol_, Jul 07 2016