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 A020121 #8 Dec 17 2012 10:36:03 %S A020121 1,1,1,3,9,38,211,1381,10451,89575,857352,9063435,104876888, %T A020121 1318452296,17893281148,260730668151,4059948975491,67279154450986, %U A020121 1182190856781604,21954973054515490,429690186924088871 %N A020121 Ceiling of GAMMA(n+4/7)/GAMMA(4/7). %p A020121 Digits := 64:f := proc(n,x) ceil(GAMMA(n+x)/GAMMA(x)); end; %Y A020121 Cf. A220609. %K A020121 nonn %O A020121 0,4 %A A020121 _Simon Plouffe_