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A001418 Number of ways of folding an n X n sheet of stamps.
(Formerly M4587 N1956)
1
1, 8, 1368, 300608, 186086600, 123912532224, 129950723279272 (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..6.

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

Eric Weisstein's World of Mathematics, Map Folding

Index entries for sequences obtained by enumerating foldings

CROSSREFS

Cf. A000136, A000560, A001417, A195646.

Sequence in context: A286315 A270112 A281127 * A123268 A088080 A230472

Adjacent sequences:  A001415 A001416 A001417 * A001419 A001420 A001421

KEYWORD

nonn,hard,more

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(6)-a(7) from Sean A. Irvine, Jan 11 2018

STATUS

approved

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Last modified January 21 02:59 EST 2019. Contains 319344 sequences. (Running on oeis4.)