Matrix square of unsigned Lah triangle abs(A008297(n,k)) or A105278(n,k).

Terms

a(0) =1a(1) =4a(2) =1a(3) =24a(4) =12a(5) =1a(6) =192a(7) =144a(8) =24a(9) =1a(10) =1920a(11) =1920a(12) =480a(13) =40a(14) =1a(15) =23040a(16) =28800a(17) =9600a(18) =1200a(19) =60a(20) =1a(21) =322560a(22) =483840a(23) =201600a(24) =33600a(25) =2520a(26) =84a(27) =1a(28) =5160960a(29) =9031680