Triangle T(n,k) read by rows, defined by T(n,k) = (n-k)*T(n-1,k)+Sum(k=1..n, T(n-1,k)); T(1,1) = 1, T(1,k)= 0 if k >1.

A089225

Triangle T(n,k) read by rows, defined by T(n,k) = (n-k)*T(n-1,k)+Sum(k=1..n, T(n-1,k)); T(1,1) = 1, T(1,k)= 0 if k >1.

Terms

    a(0) =1a(1) =2a(2) =1a(3) =7a(4) =4a(5) =3a(6) =35a(7) =22a(8) =17a(9) =14a(10) =228a(11) =154a(12) =122a(13) =102a(14) =88a(15) =1834a(16) =1310a(17) =1060a(18) =898a(19) =782a(20) =694a(21) =17582a(22) =13128a(23) =10818a(24) =9272a(25) =8142a(26) =7272a(27) =6578a(28) =195866a(29) =151560

External references