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A074424 as a simple table

na(n)
10
21
32
46
536
6240
71296
86312
931824
10165840
11883872
124861056
1327433728
14155696585
15878719104
164938274944
1727770211072
18156752183808
19889181991936
205067822213734
2128987320651922
22166186204664832
23954240788994048
245486884531697664
2531596861676172076

[0,1,2,6,36,240,1296,6312,31824,165840,883872,
 4861056,27433728,155696585,878719104,4938274944,
 27770211072,156752183808,889181991936,
 5067822213734,28987320651922,166186204664832,
 954240788994048,5486884531697664,
 31596861676172076]