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A057972 as a simple table

na(n)
33
431
5252
61776
711048
861106
9303664
101368844
115651241
1221559133
1376613440
14255411923
15803771681
162400633464
176837010458
1818644075466
1948855805143
20123415815229
21301386128354
22713271875603
231639572164669
243667859207856

[3,31,252,1776,11048,61106,303664,1368844,5651241,
 21559133,76613440,255411923,803771681,2400633464,
 6837010458,18644075466,48855805143,123415815229,
 301386128354,713271875603,1639572164669,
 3667859207856]