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A281251 as a simple table

na(n)
10
20
30
40
50
60
71
812
912
101
112
12139
13443
14139
152
169
171222
188489
198489
201222
219
2234
239151
24105368
25197429
26105368
279151
2834
29124
3063138
311113148
323291920
333291920
341113148
3563138
36124
37432
38412070
3910598099
4047427679
4176670685
4247427679
4310598099

[0,0,0,0,0,0,1,12,12,1,2,139,443,139,2,9,1222,
 8489,8489,1222,9,34,9151,105368,197429,105368,
 9151,34,124,63138,1113148,3291920,3291920,1113148,
 63138,124,432,412070,10598099,47427679,76670685,
 47427679,10598099]