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A074439 as a simple table

na(n)
10
20
33
418
560
6214
71008
85280
929160
10165840
11940896
125196096
1328304640
14155270016
15863910489
164861712448
1727554100480
18156728297088
19892662156288
205088174124950
2129045467518171
22166186204664832
23953309368018944
245481559804635648
2531581437286776820

[0,0,3,18,60,214,1008,5280,29160,165840,940896,
 5196096,28304640,155270016,863910489,4861712448,
 27554100480,156728297088,892662156288,
 5088174124950,29045467518171,166186204664832,
 953309368018944,5481559804635648,
 31581437286776820]