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 A093987 #8 Jan 31 2020 19:40:46
%S A093987 1,2,16,8388608,
%T A093987 1532495540865888858358347027150309183618739122183602176
%N A093987 a(1) = 1, a(2) = 2, a(n+1) = a(n)^(2n)/ a(n-1). Symmetrically a(n) = {a(n-1)*a(n+1)}^[1/{(n-1) +(n+1)}].
%C A093987 The next term has 535 digits. - _Harvey P. Dale_, Jan 31 2020
%e A093987 a(5) = 8388608^8/16 = 1.53249554e+54.
%e A093987 a(6) =~ 8.5173068734e+534.
%t A093987 a[1] = 1; a[2] = 2; a[n_] := a[n - 1]^(2n - 2)/a[n - 2]; Table[ a[n], {n, 6}] (* _Robert G. Wilson v_, May 24 2004 *)
%t A093987 RecurrenceTable[{a[1]==1,a[2]==2,a[n+1]==a[n]^(2n)/a[n-1]},a,{n,5}] (* _Harvey P. Dale_, Jan 31 2020 *)
%Y A093987 Cf. A093985, A093986.
%K A093987 nonn
%O A093987 1,2
%A A093987 _Amarnath Murthy_, May 22 2004
%E A093987 Edited and extended by _Robert G. Wilson v_, May 24 2004