A triangle of numbers related to triangle A030524.

Terms

a(0) =1a(1) =4a(2) =1a(3) =20a(4) =12a(5) =1a(6) =120a(7) =128a(8) =24a(9) =1a(10) =840a(11) =1400a(12) =440a(13) =40a(14) =1a(15) =6720a(16) =16240a(17) =7560a(18) =1120a(19) =60a(20) =1a(21) =60480a(22) =201600a(23) =129640a(24) =27720a(25) =2380a(26) =84a(27) =1a(28) =604800a(29) =2681280