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A007282
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Number of hexaflexagons with 3n triangles that can be folded from a straight strip of paper.
(Formerly M3489)
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1
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1, 1, 1, 4, 14, 74, 434, 2876, 19848, 143306, 1062149, 8058223, 62259820, 488630360, 3886211100, 31267852668
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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REFERENCES
| M. Kosters, A theory of hexaflexagons, Nieuw Archief Wisk., 17 (1999), 349-362.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Cf. A001683, A000207.
Sequence in context: A167144 A159483 A088127 * A009347 A161132 A186638
Adjacent sequences: A007279 A007280 A007281 * A007283 A007284 A007285
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), frb6006(AT)cs.rit.edu (Frank R. Bernhart).
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EXTENSIONS
| More terms from Mike Godfrey (m.godfrey(AT)umist.ac.uk), Apr 02 2002
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