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A129421 as a simple table

na(n)
10
21
31
46
515
6120
7933
813303
9252207
106450828
11205475039
127936493756
13363639228194
1419476976825809
151205115679461426
1685288127619421544
176845235025444882069
18618411485467843477405
1962471139399366989007575
207014991719815977343879171

[0,1,1,6,15,120,933,13303,252207,6450828,
 205475039,7936493756,363639228194,19476976825809,
 1205115679461426,85288127619421544,
 6845235025444882069,618411485467843477405,
 62471139399366989007575,7014991719815977343879171]