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 A171703 #13 Sep 24 2014 14:11:12 %S A171703 9,624,19040,30222192,592704000,12040481088,128024064000, %T A171703 1024192512000,3456649728000 %N A171703 The first n-fold intrinsically 4-palindromic number (represented in base ten). %C A171703 The fifth and sixth terms are both cubes, exploiting the simple binomial expansion as (m)(m)^3=(m^3)(3m^3)(3m^3)(m^3) for much of their status. - _James G. Merickel_, Dec 19 2009 %C A171703 The first base in which the fifth term is 4-palindromic is 209. - _James G. Merickel_, Dec 18 2009 %C A171703 a(10) <= 27653197824000, a(11) <= 27653197824000, a(12) <= 575100098496000, a(13) <= 1733189185728000, a(14) <= 1733189185728000, a(15) <= 8400090327552000. - _Hiroaki Yamanouchi_, Sep 24 2014 %e A171703 a(2)=624 is 4444 in base 5 and 1551 in base 7. %Y A171703 Cf. A171701, A171702, A171704, A171705, A171706, A171740, A171741, A171742. %K A171703 nonn,base %O A171703 1,1 %A A171703 _James G. Merickel_, Dec 16 2009 %E A171703 a(5)-a(6) from _James G. Merickel_, Dec 19 2009 %E A171703 a(7)-a(9) from _Hiroaki Yamanouchi_, Sep 24 2014