Number of multiset permutations of {1, 1, 2, 2, ..., n, n} with no fixed points.

A000459

Number of multiset permutations of {1, 1, 2, 2, ..., n, n} with no fixed points.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =10a(4) =297a(5) =13756a(6) =925705a(7) =85394646a(8) =10351036465

External references