A167182 a(0)=1, a(1)=2; for n>=2, a(n) = 2^A042950(n-2).

1, 2, 4, 8, 64, 4096, 16777216, 281474976710656, 79228162514264337593543950336, 6277101735386680763835789423207666416102355444464034512896

Offset

0,2

Comments

Term a(13) has 925 decimal digits; a(14) has 1850 decimal digits. - Michael De Vlieger, Jan 07 2015

Links

Michael De Vlieger, Table of n, a(n) for n = 0..13 [a(0)=1 from Georg Fischer, Jun 25 2021]

Formula

a(n) = (a(n-1))^2 for n > 3.

a(n) = 2^A098011(n+1). - R. J. Mathar, Apr 22 2010

Mathematica

Join[{2, 4}, NestList[#^2&, 8, 10]] (* Harvey P. Dale, Nov 30 2019 *)
Table[2^Ceiling[3 2^(i - 3)], {i, 8}] (* Trevor Cappallo, Apr 21 2021 *)

Crossrefs

Cf. A042950, A098011, A165426, A172489, A173260, A175129.

Sequence in context: A067507 A320898 A068994 * A058345 A093843 A270372

Adjacent sequences: A167179 A167180 A167181 * A167183 A167184 A167185

Keyword

nonn

Author

Giovanni Teofilatto, Oct 29 2009

Extensions

Definition corrected by R. J. Mathar, Apr 22 2010

More terms from Vincenzo Librandi, Apr 25 2010

Entry revised by N. J. A. Sloane, Jun 20 2021

Status

approved