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A270530 as a simple table

na(n)
01
15
223
3105
4484
52267
610821
752705
8262010
91328768
106867266
1136115455
12192954358
131045481465
145735154907
1531802349105
16178010615678
171004542994462
185709066033900
1932646940202200
20187701954810320

[1,5,23,105,484,2267,10821,52705,262010,1328768,
 6867266,36115455,192954358,1045481465,5735154907,
 31802349105,178010615678,1004542994462,
 5709066033900,32646940202200,187701954810320]