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A280476 as a simple table

na(n)
16
263
3997
415104
5214635
62886700
737224679
8464804972
95658641517
1067497024458
11791686330307
129155901061480
13104627294693465
141183339450854998
1513264070830389055
16147510583604457748
171629077899911720149

[6,63,997,15104,214635,2886700,37224679,464804972,
 5658641517,67497024458,791686330307,9155901061480,
 104627294693465,1183339450854998,
 13264070830389055,147510583604457748,
 1629077899911720149]