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A345973 as a simple table

na(n)
11
21
31
42
53
66
710
820
936
1073
11138
12281
13549
141136
152263
164705
179553
1820015
1941096
2086643
21179638
22380701
23795892
241693003
253562217
267612680
2716099538
2834505797
2973345831
30157678081
31336419942
32725236780
331552662599
343354979195
357205601904
3615600414855
3733594465666

[1,1,1,2,3,6,10,20,36,73,138,281,549,1136,2263,
 4705,9553,20015,41096,86643,179638,380701,795892,
 1693003,3562217,7612680,16099538,34505797,
 73345831,157678081,336419942,725236780,1552662599,
 3354979195,7205601904,15600414855,33594465666]