Triangle T(n,k) read by rows: number of rooted chains of length k in set partitions of n labeled points.

A331956

Triangle T(n,k) read by rows: number of rooted chains of length k in set partitions of n labeled points.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =0a(7) =1a(8) =4a(9) =3a(10) =0a(11) =1a(12) =14a(13) =31a(14) =18a(15) =0a(16) =1a(17) =51a(18) =255a(19) =385a(20) =180a(21) =0a(22) =1a(23) =202a(24) =2066a(25) =6110a(26) =6945a(27) =2700a(28) =0a(29) =1

External references