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A121633 as a simple table

na(n)
10
20
31
49
568
6527
74408
840303
9403046
104393339
1151955528
12663383135
139102982354
14133668773755
152092209897524
1634783032728383
17612234346270510
1811375905660965179
19222544581264066400
204572536725690159999
2198456173247669999978
222217126753620449439515

[0,0,1,9,68,527,4408,40303,403046,4393339,
 51955528,663383135,9102982354,133668773755,
 2092209897524,34783032728383,612234346270510,
 11375905660965179,222544581264066400,
 4572536725690159999,98456173247669999978,
 2217126753620449439515]