Triangle T(n,k) represents the coefficients of (x^20*d/dx)^n, where n=1,2,3,...; generalization of Stirling numbers of second kind A008277, Lah-numbers A008297.

A223522

Triangle T(n,k) represents the coefficients of (x^20*d/dx)^n, where n=1,2,3,...; generalization of Stirling numbers of second kind A008277, Lah-numbers A008297.

Terms

    a(0) =1a(1) =20a(2) =1a(3) =780a(4) =60a(5) =1a(6) =45240a(7) =4320a(8) =120a(9) =1a(10) =3483480a(11) =382200a(12) =13800a(13) =200a(14) =1a(15) =334414080a(16) =40556880a(17) =1734600a(18) =33600a(19) =300a(20) =1a(21) =38457619200a(22) =5039012160a(23) =243505080a(24) =5699400a(25) =69300a(26) =420a(27) =1

External references