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A321717 as a simple table

na(n)
01
11
24
38
439
5122
6950
75042
845594
9366243
103858148
1139916802
12494852628
136227020802
1488543569808
151308012219556
1621086562956045
17355687428096002
186427672041650478
19121645100408832002

[1,1,4,8,39,122,950,5042,45594,366243,3858148,
 39916802,494852628,6227020802,88543569808,
 1308012219556,21086562956045,355687428096002,
 6427672041650478,121645100408832002]