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A161415
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First differences of A160414.
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6
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1, 8, 12, 28, 12, 36, 36, 92, 12, 36, 36, 108, 36, 108, 108, 292, 12, 36, 36, 108, 36, 108, 108, 324, 36, 108, 108, 324, 108, 324, 324, 908, 12, 36, 36, 108, 36, 108, 108, 324, 36, 108, 108, 324, 108, 324, 324, 972, 36, 108, 108, 324, 108, 324, 324, 972, 108, 324, 324
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
O. E. Pol, Illustration of initial terms [From Omar E. Pol (info(AT)polprimos.com), Nov 11 2009]
D. Applegate, O. E. Pol, N. J. A. Sloane, The toothpick sequence and other sequences from cellular automata, arXiv:1004.3036 [math.CO] [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 16 2010]
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FORMULA
| For n > 1, a(n) = 4*A048883(n-1), except a(n) = 4*A048883(n-1) - 2n if n is a power of 2. - N. J. A. Sloane, Jul 13 2009
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MAPLE
| Contribution from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 16 2010: (Start)
isA000079 := proc(n) if type(n, 'even') then nops(numtheory[factorset](n)) = 1 ; else false ; fi ; end proc:
A048883 := proc(n) 3^wt(n) ; end proc:
A161415 := proc(n) if n = 1 then 1; elif isA000079(n) then 4*A048883(n-1)-2*n ; else 4*A048883(n-1) ; end if; end proc: seq(A161415(n), n=1..90) ; (End)
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CROSSREFS
| Cf. A139250, A139251, A160411, A160413, A160414, A160417.
Cf. A160727.
Cf. A048883, A161411, A162349. [From Omar E. Pol (info(AT)polprimos.com), Nov 11 2009]
Sequence in context: A006983 A072327 A181735 * A117802 A083485 A066934
Adjacent sequences: A161412 A161413 A161414 * A161416 A161417 A161418
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KEYWORD
| nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 20 2009, Jun 13 2009
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 16 2010
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