A008336 sorted and duplicates removed.

Terms

a(0) =1a(1) =2a(2) =6a(3) =20a(4) =24a(5) =120a(6) =140a(7) =858a(8) =924a(9) =1008a(10) =1120a(11) =10080a(12) =11088a(13) =12012a(14) =12870a(15) =176358a(16) =184756a(17) =194480a(18) =205920a(19) =3500640a(20) =3695120a(21) =3879876a(22) =4056234a(23) =87253605a(24) =90262350a(25) =93605400a(26) =97349616a(27) =2433740400a(28) =2527345800a(29) =2617608150