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A006403 as a simple table

na(n)
10
21
32
43
56
615
736
8114
9396
101565
116756
1231563
13154370
14785113
154099948
1621870704
17118624544
18652485364
193631820462
2020426666644
21115949791342
22663640383400

[0,1,2,3,6,15,36,114,396,1565,6756,31563,154370,
 785113,4099948,21870704,118624544,652485364,
 3631820462,20426666644,115949791342,663640383400]