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A281538 as a simple table

na(n)
19
23056
363840
4146956
5290073
6560972
71066920
82001002
93797780
107294930
1113957058
1226289482
1348689121
1488983896
15161189818
16290577490
17522149018
18935543592
191669547078
202965851310
215243956096
229233806648
2316204912228

[9,3056,63840,146956,290073,560972,1066920,
 2001002,3797780,7294930,13957058,26289482,
 48689121,88983896,161189818,290577490,522149018,
 935543592,1669547078,2965851310,5243956096,
 9233806648,16204912228]