Number of partial permutations of an n-set; number of n X n binary matrices with at most one 1 in each row and column.

A002720

Number of partial permutations of an n-set; number of n X n binary matrices with at most one 1 in each row and column.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =34a(4) =209a(5) =1546a(6) =13327a(7) =130922a(8) =1441729a(9) =17572114a(10) =234662231a(11) =3405357682a(12) =53334454417a(13) =896324308634

External references