164088domain: NAppears in sequencesMaximum cycle size in range [A014137(n-1)..A014138(n-1)] of permutation A071665/A071666.at n=18A089874G.f.: 1 = Sum_{n>=0} a(n) * x^n*(1 - (n+1)*x)^(n+1).at n=6A191459The number of permutations of length n sortable by 2 reversals.at n=32A228396Positions of records in A327966.at n=19A327967