Mirror image of A098473 formatted as a triangular array.

Terms

a(0) =1a(1) =2a(2) =1a(3) =6a(4) =4a(5) =1a(6) =20a(7) =18a(8) =6a(9) =1a(10) =70a(11) =80a(12) =36a(13) =8a(14) =1a(15) =252a(16) =350a(17) =200a(18) =60a(19) =10a(20) =1a(21) =924a(22) =1512a(23) =1050a(24) =400a(25) =90a(26) =12a(27) =1a(28) =3432a(29) =6468