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A174498 Topswops (2): number of permutations of cards achieving A000376(n). 1
1, 1, 2, 2, 1, 4, 2, 1, 1, 1, 1, 4, 1, 4, 2, 2, 1, 1, 2, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

This is for the topswops variation ending in sorted/identity permutation.

REFERENCES

D. E. Knuth, TAOCP, Section 7.2.1.2, Problems 107-109.

LINKS

Table of n, a(n) for n=1..20.

CROSSREFS

Cf. A000376.

Sequence in context: A129712 A051720 A022693 * A146478 A289500 A325276

Adjacent sequences:  A174495 A174496 A174497 * A174499 A174500 A174501

KEYWORD

nonn

AUTHOR

Moritz Franckenstein, Nov 28 2010

EXTENSIONS

a(20)=3 by Moritz Franckenstein, Apr 16 2011.

STATUS

approved

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Last modified October 21 11:31 EDT 2019. Contains 328295 sequences. (Running on oeis4.)