An invertible triangle of ratios of triple factorials.

Terms

a(0) =1a(1) =2a(2) =1a(3) =10a(4) =5a(5) =1a(6) =80a(7) =40a(8) =8a(9) =1a(10) =880a(11) =440a(12) =88a(13) =11a(14) =1a(15) =12320a(16) =6160a(17) =1232a(18) =154a(19) =14a(20) =1a(21) =209440a(22) =104720a(23) =20944a(24) =2618a(25) =238a(26) =17a(27) =1a(28) =4188800a(29) =2094400