|
%I #8 Feb 14 2024 19:49:51
%S 1,2,3,16,125,2821109907456,
%T 4337654948097993282537354757263188251697832994620405101744893017744569432720994168089672192211758909320807
%N a(1)=1, a(2)=2, a(n)=n^a(n-2).
%C Exponential double factorial.
%C The next term is too large to include.
%e a(1)=1;
%e a(2)=2;
%e a(3)=3^1=3;
%e a(4)=4^2=16;
%e a(5)=5^3=125;
%e a(6)=6^16=2821109907456;
%e etc.
%t a[1]=1; a[2]=2; a[n_]:=n^a[n-2]; Array[a,7] (* _Stefano Spezia_, Feb 14 2024 *)
%Y Cf. A049384.
%K easy,nonn
%O 1,2
%A _Paolo P. Lava_ and _Giorgio Balzarotti_, May 22 2008
| 