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A221031 as a simple table

na(n)
17
2119
31733
424485
5345755
64882030
768933905
8973340015
913743460075
10194056216948
112740053437074
1238689267213364
13546288396106862
147713534869291859
15108914303513829210
161537858544870732685

[7,119,1733,24485,345755,4882030,68933905,
 973340015,13743460075,194056216948,2740053437074,
 38689267213364,546288396106862,7713534869291859,
 108914303513829210,1537858544870732685]