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

Author

Dhilan Lahoti, Nov 26 2012

Keywords

• nonn

Comments

Every one of these numbers is a power of 2.

Crossrefs

Cf. A000079.

Programs

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 *)

Formula

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