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A228840 as a simple table

na(n)
02
115
2171
32160
427783
5358425
64626234
759716035
8770832207
99950150160
10128439782811
111657942687845
1221401266181778
13276254540154855
143565983915414819
1546030886147041200
16594181726489417887
177669891971371155905
1899005472955353055626

[2,15,171,2160,27783,358425,4626234,59716035,
 770832207,9950150160,128439782811,1657942687845,
 21401266181778,276254540154855,3565983915414819,
 46030886147041200,594181726489417887,
 7669891971371155905,99005472955353055626]