Diagonal of A083486.

Terms

a(0) =1a(1) =8a(2) =12a(3) =30a(4) =105a(5) =210a(6) =1155a(7) =30030a(8) =1001a(9) =34034a(10) =323323a(11) =277134a(12) =3187041a(13) =6374082a(14) =1062347a(15) =61616126a(16) =955049953a(17) =520936338a(18) =9116385915a(19) =674612557710a(20) =8648878945a(21) =709208073490