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A061558 as a simple table

na(n)
10
21
32
46
56
630
7150
81210230
932671170
10224494620
111536160080
121482708889200
139918821194590
14266029822978920
15266029822978920
1611358256064006271420
17341976204789992332560
18128642760444772214170530
192166703103992332274919550

[0,1,2,6,6,30,150,1210230,32671170,224494620,
 1536160080,1482708889200,9918821194590,
 266029822978920,266029822978920,
 11358256064006271420,341976204789992332560,
 128642760444772214170530,
 2166703103992332274919550]