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A188428 as a simple table

na(n)
10
20
30
40
50
60
70
80
91
109
1154
12276
131282
145585
1523223
1693146
17362928
181380535
195145692
2018846775
2167982489
22241940204
23850777688
242959796467
2510197732687
2634828459508
27118003182174
28396897710483
291326018464696
304402883891950
3114536059784925
3247737688829399

[0,0,0,0,0,0,0,0,1,9,54,276,1282,5585,23223,93146,
 362928,1380535,5145692,18846775,67982489,
 241940204,850777688,2959796467,10197732687,
 34828459508,118003182174,396897710483,
 1326018464696,4402883891950,14536059784925,
 47737688829399]