Triangle read by rows: T(n,k) = 2^k * (n!/k!)*binomial(n-1,k-1).

Terms

a(0) =2a(1) =4a(2) =4a(3) =12a(4) =24a(5) =8a(6) =48a(7) =144a(8) =96a(9) =16a(10) =240a(11) =960a(12) =960a(13) =320a(14) =32a(15) =1440a(16) =7200a(17) =9600a(18) =4800a(19) =960a(20) =64a(21) =10080a(22) =60480a(23) =100800a(24) =67200a(25) =20160a(26) =2688a(27) =128a(28) =80640a(29) =564480