A007282 Number of hexaflexagons with 3n triangles that can be folded from a straight strip of paper.

1, 1, 1, 4, 14, 74, 434, 2876, 19848, 143306, 1062149, 8058223, 62259820, 488630360, 3886211100, 31267852668

Offset: 1

Author

N. J. A. Sloane, frb6006(AT)cs.rit.edu (Frank R. Bernhart)

Keywords

• nonn
• more
• nice

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).

Crossrefs

Cf. A001683, A000207.

Extensions

More terms from Mike Godfrey (m.godfrey(AT)umist.ac.uk), Apr 02 2002