Triangle read by rows (1<=k<=n): T(n,k) = (n-k+1)*k! - (k-1)!

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =3a(7) =5a(8) =10a(9) =18a(10) =4a(11) =7a(12) =16a(13) =42a(14) =96a(15) =5a(16) =9a(17) =22a(18) =66a(19) =216a(20) =600a(21) =6a(22) =11a(23) =28a(24) =90a(25) =336a(26) =1320a(27) =4320a(28) =7a(29) =13