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 A255403 #7 Jun 17 2018 15:33:31
%S A255403 1,24,261332866810040451858432000000
%N A255403 Product_{k=1..n} (k^k)!.
%C A255403 The next term (a(4)) has 537 digits.
%H A255403 Vaclav Kotesovec, <a href="/A255403/b255403.txt">Table of n, a(n) for n = 1..4</a>
%t A255403 Table[Product[(k^k)!, {k, 1, n}], {n, 1, 4}]
%Y A255403 Cf. A000178, A255322, A255358, A255359, A255360.
%Y A255403 Cf. A002109, A051675, A255321, A255323, A255344.
%Y A255403 Cf. A000142, A255268, A255269.
%K A255403 nonn
%O A255403 1,2
%A A255403 _Vaclav Kotesovec_, Feb 22 2015