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Topswops (2): number of permutations of cards achieving A000376(n).
1

%I #10 Mar 30 2012 19:00:07

%S 1,1,2,2,1,4,2,1,1,1,1,4,1,4,2,2,1,1,2,3

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

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

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

%Y Cf. A000376.

%K nonn

%O 1,3

%A _Moritz Franckenstein_, Nov 28 2010

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