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A143500 as a simple table

na(n)
01
11
21
33
410
546
6244
71481
810020
974400
10599573
115200284
1248223360
13475557054
144965035754
1554672110310
16632853655686
177678552433184
1897404631390960
191288861146261679
2017752479062092470
21254051633672160696

[1,1,1,3,10,46,244,1481,10020,74400,599573,
 5200284,48223360,475557054,4965035754,54672110310,
 632853655686,7678552433184,97404631390960,
 1288861146261679,17752479062092470,
 254051633672160696]