OFFSET
1,2
MATHEMATICA
a[1] = 1; a[2] = 3; a[n_] := a[n] = a[n - 1]^a[n - 2]; Array[a, {6}] (* Michael De Vlieger, Apr 17 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Natan Arie Consigli, Apr 17 2016
STATUS
approved