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A056280 as a simple table

na(n)
10
20
30
41
510
665
7350
81700
97770
1034095
11145750
12611435
132532530
1410391395
1542355940
16171797200
17694337290
182798799150
1911259666950
2045232081795
21181509069700
22727778478075
232916342574750
2411681056021300
2546771289738800
26187226354413735
27749329038527580

[0,0,0,1,10,65,350,1700,7770,34095,145750,611435,
 2532530,10391395,42355940,171797200,694337290,
 2798799150,11259666950,45232081795,181509069700,
 727778478075,2916342574750,11681056021300,
 46771289738800,187226354413735,749329038527580]