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A004138
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A counter moving problem.
(Formerly M0872)
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1
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1, 2, 3, 8, 13, 24, 37, 66, 107, 186, 303, 516, 849, 1436, 2377, 3998, 6639, 11134, 18531, 31024, 51701, 86464, 144205, 241018, 402163, 671906, 1121463, 1873244
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| D. St. P. Barnard, 50 Observer Brain Twisters. Faber and Faber, London, 1962, p. 38.
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
| A004138:=-(-1+z**2-4*z**3+2*z**4)/(z-1)/(2*z**4-z**3+z**2+z-1); [Conjectured by S. Plouffe in his 1992 dissertation.]
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CROSSREFS
| Sequence in context: A175148 A147417 A147357 * A116503 A105204 A045692
Adjacent sequences: A004135 A004136 A004137 * A004139 A004140 A004141
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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