Triangle: a(n,m) = number of permutations of (1,2,...,n) with one or more fixed points in the m first positions.

A061018

Triangle: a(n,m) = number of permutations of (1,2,...,n) with one or more fixed points in the m first positions.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =6a(7) =10a(8) =13a(9) =15a(10) =24a(11) =42a(12) =56a(13) =67a(14) =76a(15) =120a(16) =216a(17) =294a(18) =358a(19) =411a(20) =455a(21) =720a(22) =1320a(23) =1824a(24) =2250a(25) =2612a(26) =2921a(27) =3186a(28) =5040a(29) =9360

External references