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A055552 as a simple table

na(n)
10
20
30
45
516
646
7162
8488
91282
103291
118607
1222407
1358892
14156251
15419489
161135860
173115246
188646507
1924220195

[0,0,0,5,16,46,162,488,1282,3291,8607,22407,58892,
 156251,419489,1135860,3115246,8646507,24220195]