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 A156192 #2 Mar 30 2012 16:51:15 %S A156192 1,14,49,1372,2401,33614,117649,6588344,5764801,80707214,282475249, %T A156192 7909306972,13841287201,193778020814,678223072849,75960984159088, %U A156192 33232930569601,465261027974414,1628413597910449,45595580741492572 %N A156192 Denominator of Euler(n, 1/7). %Y A156192 For numerators see A156191. %K A156192 nonn,frac %O A156192 0,2 %A A156192 _N. J. A. Sloane_, Nov 07 2009