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A001415 Number of ways of folding a 2 X n strip of stamps.
(Formerly M1891 N0745)
+0
1
1, 2, 8, 60, 320, 1980, 10512, 60788, 320896, 1787904, 9381840, 51081844 (list; graph; listen)
OFFSET

0,2

REFERENCES

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).

Lunnon, W. F.; Multi-dimensional map-folding. Comput. J. 14 1971 75-80.

LINKS

Eric Weisstein's World of Mathematics, Map Folding

Index entries for sequences obtained by enumerating foldings

CROSSREFS

Sequence in context: A162073 A162065 A027278 this_sequence A053871 A052622 A001188

Adjacent sequences: A001412 A001413 A001414 this_sequence A001416 A001417 A001418

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 21 21:21 EST 2009. Contains 167310 sequences.


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