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 A165344 #4 Feb 24 2019 07:35:08
%S A165344 1,20,75456,222049714176,1446859308630697574400,
%T A165344 47680530046593302430474043392000000,
%U A165344 15747911603441625571224989926437024694272000000000000
%N A165344 Second series of Hankel determinants based on A001044(n+1)=((n+1)!)^2 : a(n)=det(A001044(i+j-1))=det(((i+j-1)!)^2), i,j=1,2...n. Hankel transform of A001044(n+1).
%C A165344 It would be highly desirable to obtain a closed form for a(n).
%t A165344 nmax = 10; Table[Det[Table[((i+j-1)!)^2, {i, 1, k}, {j, 1, k}]], {k, 1, nmax}] (* _Vaclav Kotesovec_, Feb 24 2019 *)
%K A165344 nonn
%O A165344 0,2
%A A165344 _Karol A. Penson_, Sep 15 2009