Triangle read by rows: T(n,k)=(k+1)*n!/2 (1<=k<=n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =9a(5) =12a(6) =24a(7) =36a(8) =48a(9) =60a(10) =120a(11) =180a(12) =240a(13) =300a(14) =360a(15) =720a(16) =1080a(17) =1440a(18) =1800a(19) =2160a(20) =2520a(21) =5040a(22) =7560a(23) =10080a(24) =12600a(25) =15120a(26) =17640a(27) =20160a(28) =40320a(29) =60480