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Search: id:A001011
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| A001011 |
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Number of ways to fold a strip of n blank stamps.
(Formerly M1455 N0576)
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+0
5
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| 1, 1, 2, 5, 14, 38, 120, 353, 1148, 3527, 11622, 36627, 121622, 389560, 1301140, 4215748, 13976335, 46235800, 155741571, 512559185, 1732007938, 5732533570, 19423092113, 64590165281, 219349187968, 732358098471
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
M. Gardner, Mathematical Games, Sci. Amer. Vol. 209 (No. 3, Mar. 1963), p. 262.
J. E. Koehler, Folding a strip of stamps, J. Combin. Theory, 5 (1968), 135-152.
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LINKS
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N. J. A. Sloane, Illustration of initial terms (Fig. 17 of the 1973 Handbook of Integer Sequences)
N. J. A. Sloane, My favorite integer sequences, in Sequences and their Applications (Proceedings of SETA '98).
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences obtained by enumerating foldings
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CROSSREFS
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Cf. A000682, A086441.
Adjacent sequences: A001008 A001009 A001010 this_sequence A001012 A001013 A001014
Sequence in context: A053419 A079227 A148314 this_sequence A148315 A141752 A142586
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), legendre(AT)biologie.ens.fr (Stephane LEGENDRE)
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