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A253517 as a simple table

na(n)
181
2470
32180
49623
542669
6192393
7876277
84010555
918395493
1084458827
11387945181
121782308819
138189083701
1437627550715
15172896033837
16794452690915
173650504500581
1816774075855627
1977076986789213
20354169411790451

[81,470,2180,9623,42669,192393,876277,4010555,
 18395493,84458827,387945181,1782308819,8189083701,
 37627550715,172896033837,794452690915,
 3650504500581,16774075855627,77076986789213,
 354169411790451]