%I A123398
%S A123398 1,1,2,2,1,5,2,1,1,1,1,1,1,4,6,1
%N A123398 Topswops: number of permutations of cards achieving A000375(n).
%D A123398 D. E. Knuth, TAOCP, Section 7.2.1.2, Problems 107-109.
%Y A123398 Sequence in context: A086873 A101560 A010243 this_sequence A102849 A088333 
               A016538
%Y A123398 Adjacent sequences: A123395 A123396 A123397 this_sequence A123399 A123400 
               A123401
%K A123398 nonn
%O A123398 1,3
%A A123398 N. J. A. Sloane (njas(AT)research.att.com), Oct 15 2006