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A305000 as a simple table

na(n)
01
12
28
372
41824
5220608
6498243968
7309072306743552
814369391925598802012151296
9146629927766168786239127150948525247729660416

[1,2,8,72,1824,220608,498243968,309072306743552,
 14369391925598802012151296,
 146629927766168786239127150948525247729660416]