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A073984 as a simple table

na(n)
10
21
39
436
5210
61296
77056
840824
9262440
101700352
1110478160
1262355744
13367960320
142176782336
1512958657344
1677716392192
17468205557120
182821109907456
1916960580969472
20101758315958784
21609954817881600
223656220357427200
2321926486787222528
24131557435432187904

[0,1,9,36,210,1296,7056,40824,262440,1700352,
 10478160,62355744,367960320,2176782336,
 12958657344,77716392192,468205557120,
 2821109907456,16960580969472,101758315958784,
 609954817881600,3656220357427200,
 21926486787222528,131557435432187904]