

A060135


Sequence of adjacent transpositions (a[n] a[n]+1), which, when starting from the identity permutation and applied successively, produce a Hamiltonian circuit through all permutations of S_4, in such way that S_{n1} is always traversed before the rest of S_n. Furthermore, each subsequence from the first to the (n!1)th term is palindromic.


2



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