Triangle of numbers used for basis change between certain falling factorials.

Terms

a(0) =1a(1) =1a(2) =4a(3) =1a(4) =12a(5) =30a(6) =1a(7) =24a(8) =168a(9) =336a(10) =1a(11) =40a(12) =540a(13) =2880a(14) =5040a(15) =1a(16) =60a(17) =1320a(18) =13200a(19) =59400a(20) =95040a(21) =1a(22) =84a(23) =2730a(24) =43680a(25) =360360a(26) =1441440a(27) =2162160a(28) =1a(29) =112