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A048001 as a simple table

na(n)
10
20
30
40
50
60
72
812
918
1063
11168
12224
13504
141014
151270
162420
174620
185742
1912012
2027027
2135035
2284119
23199304
24260064
25601664
261339464
271720944
283755844
298093214
3010329750
3122591800
3249876200
3364071194
34144780009

[0,0,0,0,0,0,2,12,18,63,168,224,504,1014,1270,
 2420,4620,5742,12012,27027,35035,84119,199304,
 260064,601664,1339464,1720944,3755844,8093214,
 10329750,22591800,49876200,64071194,144780009]