Triangle of unsigned 3-Lah numbers.

Terms

a(0) =1a(1) =6a(2) =1a(3) =42a(4) =14a(5) =1a(6) =336a(7) =168a(8) =24a(9) =1a(10) =3024a(11) =2016a(12) =432a(13) =36a(14) =1a(15) =30240a(16) =25200a(17) =7200a(18) =900a(19) =50a(20) =1a(21) =332640a(22) =332640a(23) =118800a(24) =19800a(25) =1650a(26) =66a(27) =1a(28) =3991680a(29) =4656960