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A028447 as a simple table

na(n)
01
13
232
3229
41845
514320
6112485
7880163
86895792
954003765
10422983905
113312866080
1225947198337
13203223953179
141591695681488
1512466511517581
1697640484615909
17764741896529104
185989627994067061
1946912093390144139
20367425909133064576
212877761124002870925

[1,3,32,229,1845,14320,112485,880163,6895792,
 54003765,422983905,3312866080,25947198337,
 203223953179,1591695681488,12466511517581,
 97640484615909,764741896529104,5989627994067061,
 46912093390144139,367425909133064576,
 2877761124002870925]