A114561 a(0) = 0; thereafter a(n+1) = 4^a(n).

0, 1, 4, 256, 13407807929942597099574024998205846127479365820592393377723561443721764030073546976801874298166903427690031858186486050853753882811946569946433649006084096

Offset

0,3

Comments

Or, define two sequences by q(0) = 0, p(n) = 2^q(n), q(n+1) = p(n)^2; sequence gives q(n).

4-ish analog of A014221 and A014222. - Henry Bottomley, Feb 16 2006

Links

Table of n, a(n) for n=0..4.

Mathematica

NestList[4^# &, 0, 4] (* Paolo Xausa, Jul 23 2024 *)

Crossrefs

Cf. A114560, A081651, A014221, A014222.

Sequence in context: A057156 A132656 A137840 * A252586 A214136 A068417

Adjacent sequences: A114558 A114559 A114560 * A114562 A114563 A114564

Keyword

nonn

Author

Jeremy Gardiner, Feb 15 2006

Status

approved