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A001010 Number of symmetric foldings of a strip of n stamps.
(Formerly M0323 N0120)
4
1, 2, 2, 4, 6, 8, 18, 20, 56, 48, 178, 132, 574, 348, 1870, 1008, 6144, 2812, 20314, 8420, 67534, 24396, 225472, 74756, 755672, 222556, 2540406, 693692, 8564622, 2107748, 28941258, 6656376, 98011464, 20548932 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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=1..34.

R. Dickau, Symmetric Stamp Foldings

R. Dickau, Symmetric Stamp Foldings [Cached copy, pdf format, with permission]

J. E. Koehler, Folding a strip of stamps, J. Combin. Theory, 5 (1968), 135-152.

J. E. Koehler, Folding a strip of stamps, J. Combin. Theory, 5 (1968), 135-152. [Annotated, corrected, scanned copy]

Frank Ruskey, Information on Stamp Foldings

Eric Weisstein's World of Mathematics, Stamp Folding.

Index entries for sequences obtained by enumerating foldings

FORMULA

a(2n) = 2*A000682(n+1), a(2n+1) = 2*A007822(n). - Sean A. Irvine, Mar 18 2013

CROSSREFS

Cf. A007822, A000682.

Sequence in context: A216214 A269298 A153964 * A091966 A231187 A055529

Adjacent sequences:  A001007 A001008 A001009 * A001011 A001012 A001013

KEYWORD

nonn,nice

AUTHOR

N. J. A. Sloane, St├ęphane Legendre

STATUS

approved

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Last modified March 23 22:30 EDT 2017. Contains 283985 sequences.