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Search: id:A000643
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| A000643 |
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a(n)=a(n-1) + 2^a(n-2). |
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+0
3
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| 0, 0, 1, 2, 4, 8, 24, 280, 16777496, 19426688922257290709194619068235189066424068390521395212518124097389042852052252\ 75672
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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The next term is too large to include.
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REFERENCES
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D. E. Knuth, personal communication.
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MATHEMATICA
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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}]]] [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 18 2009]
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CROSSREFS
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Cf. A000659.
Sequence in context: A002908 A004528 A066535 this_sequence A112285 A037170 A006399
Adjacent sequences: A000640 A000641 A000642 this_sequence A000644 A000645 A000646
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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1 more term from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 19 2000
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