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 A255321 #13 Sep 08 2015 13:54:51
%S A255321 1,256,1952152956156672,
%T A255321 664283228512699358734362008580999708796213453161234432
%N A255321 Product_{k=1..n} k^(k^3).
%C A255321 The next term a(5) has 142 digits.
%H A255321 Vaclav Kotesovec, <a href="/A255321/b255321.txt">Table of n, a(n) for n = 1..7</a>
%F A255321 a(n) ~ A243263 * n^(n^2*(n+1)^2/4 - 1/120) / exp(n^4/16 - n^2/12).
%t A255321 Table[Product[k^(k^3), {k, 1, n}], {n, 1, 6}]
%o A255321 (PARI) a(n)=prod(k=2,n,k^k^3) \\ _Charles R Greathouse IV_, Sep 08 2015
%Y A255321 Cf. A002109, A051675, A255323, A255344, A243263.
%K A255321 nonn
%O A255321 1,2
%A A255321 _Vaclav Kotesovec_, Feb 21 2015