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A004046 as a simple table

na(n)
01
10
20
326208
4530712
56368544
647331648
7256864608
81116087336
94092877152
1012996075456
1137058557536
1296952754808
13232778774592
14526258264896
151128148021728
162286143305992
174451523096384
188386247967552
1915130902687264
2026614339616592
2145684687301344

[1,0,0,26208,530712,6368544,47331648,256864608,
 1116087336,4092877152,12996075456,37058557536,
 96952754808,232778774592,526258264896,
 1128148021728,2286143305992,4451523096384,
 8386247967552,15130902687264,26614339616592,
 45684687301344]