A168088 a(n) = 2^tetranacci(n).

1, 1, 1, 2, 2, 4, 16, 256, 32768, 536870912, 72057594037927936, 324518553658426726783156020576256, 411376139330301510538742295639337626245683966408394965837152256

Offset

0,4

Links

Harvey P. Dale, Table of n, a(n) for n = 0..16

Index to divisibility sequences

Formula

a(n) = 2^A000078(n).

Mathematica

a={1, 0, 0, 0}; Flatten[Prepend[Table[s=Plus@@a; a=RotateLeft[a]; z=a[[ -1]]=s; z=2^z, {n, 12}], Table[0, {m, Length[a]-1}]]]
2^LinearRecurrence[{1, 1, 1, 1}, {0, 0, 0, 1}, 15] (* Harvey P. Dale, Dec 12 2017 *)

Crossrefs

Cf. A000078.

Subsequence of A000079.

Sequence in context: A090753 A091788 A063401 * A168089 A165420 A171163

Adjacent sequences: A168085 A168086 A168087 * A168089 A168090 A168091

Keyword

nonn,easy

Author

Vladimir Joseph Stephan Orlovsky, Nov 18 2009

Extensions

a(0)-a(2) and offset corrected by Charles R Greathouse IV, Jul 19 2012

Status

approved