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 A164334 #11 Sep 14 2017 17:11:05
%S A164334 1,1,2,48,21233664,1016411962239204484414785454080
%N A164334 Quartic recurrence sequence a(0) = 1, a(n) = n*a(n-1)^4.
%C A164334 Number of different orderings for n-input trees in a Free Quaternary Decision Diagram.
%C A164334 The next term has 121 digits. - _Harvey P. Dale_, Dec 19 2016
%H A164334 G. C. Greubel, <a href="/A164334/b164334.txt">Table of n, a(n) for n = 0..7</a>
%F A164334 a(0) = 1, a(n) = n*a(n-1)^4.
%t A164334 nxt[{n_,a_}]:={n+1,(n+1)a^4}; NestList[nxt,{0,1},5][[All,2]] (* _Harvey P. Dale_, Dec 19 2016 *)
%o A164334 (PARI) a(n) = if (n==0, 1, n*a(n-1)^4); \\ _Michel Marcus_, Sep 14 2017
%Y A164334 Quartic extension of A052129 and A123851.
%K A164334 nonn
%O A164334 0,3
%A A164334 David Willingham (D.Willingham(AT)wmin.ac.uk), Aug 13 2009