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A003230
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Expansion of 1/((1-x)*(1-2x)*(1-x-2x^3)).
(Formerly M3417)
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1
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1, 4, 11, 28, 67, 152, 335, 724, 1539, 3232, 6727, 13900, 28555, 58392, 118959, 241604, 489459, 989520, 1997015, 4024508, 8100699, 16289032, 32726655, 65705268, 131837763, 264399936, 530028199, 1062139180, 2127809963
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| D. E. Daykin and S. J. Tucker, Introduction to Dragon Curves. Unpublished, 1976.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| S. Plouffe, Approximations de S\'{e}ries G\'{e}n\'{e}ratrices et Quelques Conjectures, Dissertation, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.
S. Plouffe, 1031 Generating Functions and Conjectures, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.
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MAPLE
| A003230:=-1/(z-1)/(2*z-1)/(-1+z+2*z**3); [Conjectured by S. Plouffe in his 1992 dissertation.]
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CROSSREFS
| Sequence in context: A090539 A113478 A056601 * A099326 A127985 A005409
Adjacent sequences: A003227 A003228 A003229 * A003231 A003232 A003233
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Aug 21 2000
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