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

Author

Moritz Franckenstein, Nov 28 2010

Keywords

• nonn

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.

Crossrefs

Cf. A000376.

Extensions

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