A271938 a(1) = 1, a(2) = 3, a(n) = a(n-1)^a(n-2).

1, 3, 3, 27, 19683, 87189642485960958202911070585860771696964072404731750085525219437990967093723439943475549906831683116791055225665627

Offset

1,2

Links

Table of n, a(n) for n=1..6.

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

Cf. A264932 with a(n-1)^^a(n-2) or a(n-1)^a(n-2)^a(n-2);

Cf. A051285 (with a(2) = 2).

Sequence in context: A369013 A215829 A098340 * A075020 A138962 A139206

Adjacent sequences: A271935 A271936 A271937 * A271939 A271940 A271941

Keyword

nonn

Author

Natan Arie Consigli, Apr 17 2016

Status

approved