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Search: id:A005688
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| A005688 |
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Numbers of Twopins positions.
(Formerly M0647)
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+0
1
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| 1, 2, 3, 5, 7, 10, 14, 20, 30, 45, 69, 104, 157, 236, 356, 540, 821, 1252, 1908, 2909, 4434, 6762, 10319, 15755, 24066, 36766, 56176, 85837, 131172, 200471, 306410
(list; graph; listen)
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OFFSET
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5,2
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REFERENCES
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R. K. Guy, ``Anyone for Twopins?,'' in D. A. Klarner, editor, The Mathematical Gardner. Prindle, Weber and Schmidt, Boston, 1981, pp. 2-15.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
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G.f.: [x^5(1-x^2+x^3-2x^5-x^6-x^7-x^8-x^9)]/[(1-x^2-x^5)(1-2x+x^2-x^5)]. - Ralf Stephan, Apr 22 2004
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CROSSREFS
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Sequence in context: A094984 A107332 A002062 this_sequence A120446 A082531 A092021
Adjacent sequences: A005685 A005686 A005687 this_sequence A005689 A005690 A005691
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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