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A308241 as a simple table

na(n)
01
12
25
318
468
5244
6880
73228
811905
943966
10162498
11600984
122222776
138218022
1430368708
15112162230
16414006377
171527214022
185630258676
1920744334800
2076387507859
21281129870088
221034103899368
233801934437930
2413971364199298
2551318841190524
26188420580871859

[1,2,5,18,68,244,880,3228,11905,43966,162498,
 600984,2222776,8218022,30368708,112162230,
 414006377,1527214022,5630258676,20744334800,
 76387507859,281129870088,1034103899368,
 3801934437930,13971364199298,51318841190524,
 188420580871859]