A triangle of numbers related to triangle A030527.

Terms

a(0) =1a(1) =6a(2) =1a(3) =42a(4) =18a(5) =1a(6) =336a(7) =276a(8) =36a(9) =1a(10) =3024a(11) =4200a(12) =960a(13) =60a(14) =1a(15) =30240a(16) =66024a(17) =23400a(18) =2460a(19) =90a(20) =1a(21) =332640a(22) =1086624a(23) =557424a(24) =87360a(25) =5250a(26) =126a(27) =1a(28) =3991680a(29) =18805248