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A003806 as a simple table

na(n)
1699612310033197642547200
2124190524600592082795473760093457612800
31341733356588640095264385107865053233298800640000
478616578542037111790447631835937500000000000000000000000
539573939034651534226739680064959446854442420750012276098670264320000

[699612310033197642547200,
 124190524600592082795473760093457612800,
 1341733356588640095264385107865053233298800640000,
 78616578542037111790447631835937500000000000000000\
 000000,
 39573939034651534226739680064959446854442420750012\
 276098670264320000]