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A347989 as a simple table

na(n)
01
15
271
31665
454649
52310945
6119753843
77353403057
8522289211873
942137920501677
103807384320667135
11380929847762489025
1241811136672902061321
134995760464106519955705
14645541681316043216096315
1589705032647088734873129825
1613340173206548155385625683265
172114001534402053456524492822485

[1,5,71,1665,54649,2310945,119753843,7353403057,
 522289211873,42137920501677,3807384320667135,
 380929847762489025,41811136672902061321,
 4995760464106519955705,645541681316043216096315,
 89705032647088734873129825,
 13340173206548155385625683265,
 2114001534402053456524492822485]