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A055837 as a simple table

na(n)
03
115
273
3361
41806
59122
646425
7237721
81223365
96321965
1032784830
11170528190
12889291352
134648068192
1424342384337
15127707864849
16671047979300
173531026714720
1818603737992455
1998129545962855
20518149580437560

[3,15,73,361,1806,9122,46425,237721,1223365,
 6321965,32784830,170528190,889291352,4648068192,
 24342384337,127707864849,671047979300,
 3531026714720,18603737992455,98129545962855,
 518149580437560]