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 A066582 #5 Dec 05 2013 19:55:05 %S A066582 2,15,7,21,108,2268,5040,79380,20575296,147,1134,102060,555660, %T A066582 1102248,1524096,48988800,1365590016,17360406,437482231200, %U A066582 559977255936,92876046336,743317957509120,4592700000000,133978933305000000 %N A066582 Product of nonzero digits of A066549(n). %e A066582 The third term of A066549 is 711 hence a(3) = 7. %Y A066582 Cf. A066549. %K A066582 easy,nonn,base %O A066582 1,1 %A A066582 _Amarnath Murthy_, Dec 21 2001 %E A066582 More terms from _Sascha Kurz_, Jan 28 2003