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A001416 Number of ways of folding a 3 X n strip of stamps.
(Formerly M4271 N1785)
0
1, 6, 60, 1368, 15552, 201240, 2016432, 21582624, 201060768, 1944012744, 17257455960, 156760071600, 1346073913440, 11734199738820, 98420246759688 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..14.

W. F. Lunnon, Multi-dimensional map-folding, Computer Journal 14 1971 75-80.

Index entries for sequences obtained by enumerating foldings

CROSSREFS

Sequence in context: A248655 A092356 A285955 * A251184 A003267 A271681

Adjacent sequences:  A001413 A001414 A001415 * A001417 A001418 A001419

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

a(8)-a(14) from Fred Lunnon and Sean A. Irvine, Dec 26 2017

STATUS

approved

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Last modified January 22 09:52 EST 2019. Contains 319363 sequences. (Running on oeis4.)