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A005691
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Number of Twopins positions.
(Formerly M0643)
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1
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1, 2, 3, 5, 7, 10, 13, 18, 24, 35, 50, 75, 109, 161, 231, 336, 482, 703, 1020, 1498, 2188, 3214, 4694, 6877, 10039, 14699, 21487, 31489, 46097, 67582, 98977, 145071
(list; graph; refs; listen; history; internal format)
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OFFSET
| 6,2
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REFERENCES
| 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
| G.f.: [x^6(1-x^2+x^3-2x^6-x^7-x^8-x^9-x^10-x^11)]/[(x^3-x+1)(x^3+x-1)(x^6+x^2-1)]. - Ralf Stephan, Apr 22 2004
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CROSSREFS
| Sequence in context: A088318 A038083 A060688 * A172491 A035954 A023192
Adjacent sequences: A005688 A005689 A005690 * A005692 A005693 A005694
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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