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A051285 a(1) = 1, a(2) = 2, a(n) = a(n-1)^a(n-2). 4
1, 2, 2, 4, 16, 65536, 115792089237316195423570985008687907853269984665640564039457584007913129639936 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

MATHEMATICA

RecurrenceTable[{a[1]==1, a[2]==2, a[n]==a[n-1]^a[n-2]}, a, {n, 7}] (* Vincenzo Librandi, Dec 17 2015 *)

PROG

(MAGMA) I:=[1, 2]; [n le 2 select I[n] else Self(n-1)^Self(n-2): n in [1..7]]; // Vincenzo Librandi, Dec 17 2015

(PARI) a(n) = if(n<3, n, a(n-1)^a(n-2)); \\ Altug Alkan, Dec 17 2015

CROSSREFS

Sequence in context: A070283 A070282 A267218 * A079556 A232161 A052628

Adjacent sequences:  A051282 A051283 A051284 * A051286 A051287 A051288

KEYWORD

easy,nonn

AUTHOR

Matt Kasper (matt192837(AT)hotmail.com)

EXTENSIONS

Name changed and first term added by Natan Arie' Consigli, Dec 17 2015

STATUS

approved

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Last modified January 16 03:30 EST 2019. Contains 319184 sequences. (Running on oeis4.)