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A180780 as a simple table

na(n)
10
20
322
4499
59730
6136491
71430727
811783122
978770456
10443607864
112151608155
129218591346
1335373572400
14123749340262
15398005623516
161192411118090
173344070542568
188869510553867
1922304900540593
2053635016669434

[0,0,22,499,9730,136491,1430727,11783122,78770456,
 443607864,2151608155,9218591346,35373572400,
 123749340262,398005623516,1192411118090,
 3344070542568,8869510553867,22304900540593,
 53635016669434]