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A003454 as a simple table

na(n)
31
42
56
625
7107
8509
92468
1012258
1161797
12315830
131630770
148498303
1544629855
16235974495
171255105304
186710883952
1936050676617
20194478962422
211053120661726
225722375202661
2331191334491891
24170504130213135
25934495666529380
265134182220623958
2728270742653671621

[1,2,6,25,107,509,2468,12258,61797,315830,1630770,
 8498303,44629855,235974495,1255105304,6710883952,
 36050676617,194478962422,1053120661726,
 5722375202661,31191334491891,170504130213135,
 934495666529380,5134182220623958,
 28270742653671621]