Irregular triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k isolated fixed points.

A184178

Irregular triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k isolated fixed points.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =2a(4) =3a(5) =3a(6) =13a(7) =8a(8) =3a(9) =56a(10) =51a(11) =12a(12) =1a(13) =325a(14) =294a(15) =93a(16) =8a(17) =2193a(18) =2068a(19) =687a(20) =90a(21) =2a(22) =17133a(23) =16392a(24) =5862a(25) =888a(26) =45a(27) =151403a(28) =146484a(29) =54861

External references