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A168088 a(n) = 2^tetranacci(n). 2
1, 1, 1, 2, 2, 4, 16, 256, 32768, 536870912, 72057594037927936, 324518553658426726783156020576256, 411376139330301510538742295639337626245683966408394965837152256 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 7 11:34 EDT 2020. Contains 336275 sequences. (Running on oeis4.)