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A000643 a(n) = a(n-1) + 2^a(n-2). 2
0, 0, 1, 2, 4, 8, 24, 280, 16777496, 1942668892225729070919461906823518906642406839052139521251812409738904285205225275672 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

The next term is too large to include.

REFERENCES

D. E. Knuth, personal communication.

LINKS

Table of n, a(n) for n=0..9.

MATHEMATICA

Off[General::ovfl]; a={1, 0}; Flatten[Prepend[Table[s=Plus@@a; a=2^(RotateLeft[a]); a[[ -1]]=s, {n, 8}], Table[0, {m, Length[a]-1}]]] (* Vladimir Joseph Stephan Orlovsky, Nov 18 2009 *)

CROSSREFS

Cf. A000659.

Sequence in context: A066535 A134455 A191700 * A261489 A286936 A323948

Adjacent sequences:  A000640 A000641 A000642 * A000644 A000645 A000646

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

1 more term from Vladeta Jovovic, Mar 19 2000

STATUS

approved

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Last modified September 19 23:31 EDT 2019. Contains 327207 sequences. (Running on oeis4.)