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A206817 as a simple table

na(n)
21
310
473
5520
63967
733334
8309661
93166468
1035416555
11430546642
125655609529
1379856902816
141206424711303
1519419937594990
16331860183278677
176000534640290364
18114462875817046051
192297294297649673738
2048394006967070653425

[1,10,73,520,3967,33334,309661,3166468,35416555,
 430546642,5655609529,79856902816,1206424711303,
 19419937594990,331860183278677,6000534640290364,
 114462875817046051,2297294297649673738,
 48394006967070653425]