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 A274303 #3 Jun 20 2016 13:16:09 %S A274303 8,24,7680,64,3715891200,194641920,1428329123020800,160, %T A274303 1678343852714360832000,637770664031457116160000, %U A274303 4714400748520531002654720000,2602349213183333113465405440000,27064431817106664380040216576000000 %N A274303 A bisection of A007346. %Y A274303 Cf. A007346, A002866, A002671. %K A274303 nonn %O A274303 0,1 %A A274303 _N. J. A. Sloane_, Jun 20 2016