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A372794 as a simple table

na(n)
21
31
43
54
631
715
855
9110
10280
11797
121419
133557
145647
1519559
1659708
17360726
18346487
192018032
202106172
2113228494
2213994982
2365426469
24110980446
25257148638
26660593345
271966842579
283909078573
2920820932559
3026864715089
31144689720443
32307476230099
33571509614773

[1,1,3,4,31,15,55,110,280,797,1419,3557,5647,
 19559,59708,360726,346487,2018032,2106172,
 13228494,13994982,65426469,110980446,257148638,
 660593345,1966842579,3909078573,20820932559,
 26864715089,144689720443,307476230099,
 571509614773]