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A045829 as a simple table

na(n)
10
20
30
41
512
694
7612
83605
919992
10106644
11554184
122827902
1314244120
1471073860
15352180920
161736103460
178525167680
1841741310400
19203929367040
20994680578505
214845761001756
2223586190895078
23114731538098100
24557859491227841

[0,0,0,1,12,94,612,3605,19992,106644,554184,
 2827902,14244120,71073860,352180920,1736103460,
 8525167680,41741310400,203929367040,994680578505,
 4845761001756,23586190895078,114731538098100,
 557859491227841]