%N Number of permutations of 1..n with the number moved left exceeding the number moved right by 2.
%Y Column k=2 (or k=-2) of A062866.
%Y Equal number moved left and right, see A062868.
%A _R. H. Hardin_, Jul 19 2010
%E a(19)-a(20) from _Alois P. Heinz_, Jul 31 2018