A174498 Topswops (2): number of permutations of cards achieving A000376(n).

1, 1, 2, 2, 1, 4, 2, 1, 1, 1, 1, 4, 1, 4, 2, 2, 1, 1, 2, 3

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