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 A066119 #2 Mar 30 2012 18:51:35 %S A066119 2,3,2,5,6,2,7,30,12,2,11,210,360,24,2,13,2310,75600,8640,48,2,17, %T A066119 30030,174636000,653184000,414720,96,2,19,510510,5244319080000, %U A066119 114069441024000000,270888468480000,39813120,192,2,23,9699690 %N A066119 Multi-level primorials: triangle with a(n,k)=a(n-1,k-1)*a(n-1,k) but with a(n,1)=p(n) and a(n,n)=2. %e A066119 a(4,3)=a(3,2)*a(3,3)=6*2=12. Rows start 2; 3,2; 5,6,2; 7,30,12,2; ... %Y A066119 Columns include A000040, A002110, A006939 and A066120. Right hand side includes A007395 and A007283. Cf. A066121. %K A066119 nonn,tabl %O A066119 1,1 %A A066119 _Henry Bottomley_, Dec 05 2001