%I A055388
%S A055388 2,2,4,6,6,10,12,4
%N A055388 Number of riffle shuffles of 2n cards required to return the deck to 
               initial state.
%D A055388 The College Math. Journal, Volume 26, Number 3, page 225, May '95.
%Y A055388 Sequence in context: A005341 A137268 A008130 this_sequence A065457 A000784 
               A092991
%Y A055388 Adjacent sequences: A055385 A055386 A055387 this_sequence A055389 A055390 
               A055391
%K A055388 easy,nonn
%O A055388 1,1
%A A055388 Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 05 2000
%E A055388 Probably an incorrect version of A002326.