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A222538 as a simple table

na(n)
15
219
370
4772
53872
644498
7244106
82895313
916220695
10193518017
111095187013
1213140785478
1374882449329
14902437854334
155167965116150
1662504530916068
17359312728848315
184358377223219062
1925131524034389414
20305565415963242588

[5,19,70,772,3872,44498,244106,2895313,16220695,
 193518017,1095187013,13140785478,74882449329,
 902437854334,5167965116150,62504530916068,
 359312728848315,4358377223219062,
 25131524034389414,305565415963242588]