A219735 a(n) = (a(n-2) * a(n-1))^2, with a(0) = 1 and a(1) = 2.

1, 2, 4, 64, 65536, 17592186044416, 1329227995784915872903807060280344576

Offset

0,2

Comments

Every one of these numbers is a power of 2.

Links

Table of n, a(n) for n=0..6.

Formula

a(n) = 2^A002605(n).

Mathematica

RecurrenceTable[{a[0]==1, a[1]==2, a[n]==(a[n-1]*a[n-2])^2}, a, {n, 7}] (* Harvey P. Dale, Apr 23 2015 *)

Crossrefs

Cf. A000079.

Sequence in context: A232444 A088079 A118993 * A279969 A361228 A018364

Adjacent sequences: A219732 A219733 A219734 * A219736 A219737 A219738

Keyword

nonn

Author

Dhilan Lahoti, Nov 26 2012

Status

approved