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 A212655 #27 Apr 16 2013 12:41:28 %S A212655 1,4,112,64,2816,93184,4096,278528,8716288,2883584 %N A212655 Denominator of Bernoulli(2*n,1/2) / Period of length 2: repeat 12, 60. %C A212655 See A165949(n) = (A027642(n+1)=A027762(n))/A165734(n). %C A212655 a(n) is divisible by 4^(n-1). %F A212655 a(n) = A033469(n)/A040874(n). %F A212655 a(n) = 4^(n-1) * A165949(n). %e A212655 a(1) = (B(2,1/2)=12)/12=1, a(2)=240/60=4, a(3)=1344/12=112, a(4)=3840/60=64. %Y A212655 Cf. A000302. %K A212655 nonn,less %O A212655 1,2 %A A212655 _Paul Curtz_, Apr 14 2013