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A348420 as a simple table

na(n)
01
11
23
315
4135
51485
622275
7467775
810758825
9312005925
1010296195525
11360366843375
1214054306891625
13576226582556625
1429387555710387875
151557540452650557375
1698125048516985114625
176378128153604032450625
18440090842598678239093125

[1,1,3,15,135,1485,22275,467775,10758825,
 312005925,10296195525,360366843375,14054306891625,
 576226582556625,29387555710387875,
 1557540452650557375,98125048516985114625,
 6378128153604032450625,440090842598678239093125]