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A274066 as a simple table

na(n)
12
29
350
4285
51129
64791
717219
863640
9182143
10598332
111622713
124807733
1312097755
1434041279
1581727927
16221397591
17519077550
181343959858
193089610203
207776466084
2117320256047
2242922087359
2394826300116
24228462204560

[2,9,50,285,1129,4791,17219,63640,182143,598332,
 1622713,4807733,12097755,34041279,81727927,
 221397591,519077550,1343959858,3089610203,
 7776466084,17320256047,42922087359,94826300116,
 228462204560]