Triangle read by rows. A generalization of unsigned Lah numbers, called L[3,1].

Terms

a(0) =1a(1) =2a(2) =1a(3) =10a(4) =10a(5) =1a(6) =80a(7) =120a(8) =24a(9) =1a(10) =880a(11) =1760a(12) =528a(13) =44a(14) =1a(15) =12320a(16) =30800a(17) =12320a(18) =1540a(19) =70a(20) =1a(21) =209440a(22) =628320a(23) =314160a(24) =52360a(25) =3570a(26) =102a(27) =1a(28) =4188800a(29) =14660800