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A215643 as a simple table

na(n)
01
11
22
315
4104
5890
68814
7100660
81288048
918337680
10286674960
114882660464
1289880715704
131777384045944
1437552294300416
15843830334815640
1620086549955304384
17504750167170162944
1813348550475903813120
19370499740676381737728
2010766442934111876381440

[1,1,2,15,104,890,8814,100660,1288048,18337680,
 286674960,4882660464,89880715704,1777384045944,
 37552294300416,843830334815640,20086549955304384,
 504750167170162944,13348550475903813120,
 370499740676381737728,10766442934111876381440]