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A056387 as a simple table

na(n)
10
20
33
421
539
6285
7309
81638
93099
1014109
1117157
12135918
13130995
14789819
151791447
165425938
178047839
1864463793
1964486017
20437310162
21871626729
223136882659
234278115101
2435355495078
2542359479599

[0,0,3,21,39,285,309,1638,3099,14109,17157,135918,
 130995,789819,1791447,5425938,8047839,64463793,
 64486017,437310162,871626729,3136882659,
 4278115101,35355495078,42359479599]