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A180831 as a simple table

na(n)
10
20
30
40
59
6166
73474
836866
9345458
102263066
1113182593
1261265760
13260084494
14944238967
153208593348
169709481260
1727970062531
1873672570068
19187003944842
20441746651920
211014700253185
222196105354893
234653016292528
249374868346319

[0,0,0,0,9,166,3474,36866,345458,2263066,13182593,
 61265760,260084494,944238967,3208593348,
 9709481260,27970062531,73672570068,187003944842,
 441746651920,1014700253185,2196105354893,
 4653016292528,9374868346319]