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 A255359 #13 Apr 25 2024 08:27:59
%S A255359 1,1,20922789888000
%N A255359 a(n) = Product_{k=0..n} (k^4)!.
%C A255359 The next term a(3) has 135 digits.
%H A255359 Vaclav Kotesovec, <a href="/A255359/b255359.txt">Table of n, a(n) for n = 0..4</a>
%F A255359 a(n) ~ c * n^(1 + 28*n/15 + 4*n^3/3 + 2*n^4 + 4*n^5/5) * (2*Pi)^(n/2) / exp(19*n/9 + n^4/2 + 9*n^5/25), where c = A255438 = 6.644987918706354049483118... .
%F A255359 a(n) = Product_{j=1..n^4} j^(n - ceiling(j^(1/4)) + 1). - _Vaclav Kotesovec_, Apr 25 2024
%t A255359 Table[Product[(k^4)!, {k, 0, n}], {n, 0, 5}]
%t A255359 Table[Product[j^(n - Ceiling[j^(1/4)] + 1), {j, 1, n^4}], {n, 0, 5}] (* _Vaclav Kotesovec_, Apr 25 2024 *)
%Y A255359 Cf. A000178, A255322, A255358, A255360.
%Y A255359 Cf. A002109, A051675, A255321, A255323, A255344.
%Y A255359 Cf. A000142, A255268, A255269, A255438.
%K A255359 nonn
%O A255359 0,3
%A A255359 _Vaclav Kotesovec_, Feb 21 2015