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A108306 as a simple table

na(n)
01
16
221
381
4306
51161
64401
716686
863261
9239841
10909306
113447441
1213070241
1349553046
14187869861
15712268721
162700415746
1710238053401
1838815407441
19147160382526
20557927369901
212115263257281
228019571881546
2330404505416481
24115272231894081

[1,6,21,81,306,1161,4401,16686,63261,239841,
 909306,3447441,13070241,49553046,187869861,
 712268721,2700415746,10238053401,38815407441,
 147160382526,557927369901,2115263257281,
 8019571881546,30404505416481,115272231894081]