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A141580 as a simple table

na(n)
10
21
32
46
518
678
7456
84299
968754
101990286
11106088988
1210454883132
131904236651216
14641859005526860
15401547534010157680
16467956331904669136874
171019785644052109276678788
184171197546082606538129623140

[0,1,2,6,18,78,456,4299,68754,1990286,106088988,
 10454883132,1904236651216,641859005526860,
 401547534010157680,467956331904669136874,
 1019785644052109276678788,
 4171197546082606538129623140]