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A221390 as a simple table

na(n)
10
20
313
41198
552320
62204556
786673898
83361458245
9128992693561
104928816080380
11187851827622672
127150418585672281
13271982464009887803
1410341601574159713990
15393139667142067892978
1614943725056237306101598

[0,0,13,1198,52320,2204556,86673898,3361458245,
 128992693561,4928816080380,187851827622672,
 7150418585672281,271982464009887803,
 10341601574159713990,393139667142067892978,
 14943725056237306101598]