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A222772 as a simple table

na(n)
10
220
396
4465
52608
615077
789811
8544302
93349328
1020823047
11130535918
12823585242
135221057054
1433231082276
15212180118775
161358528423728
178718262087314
1856062919553225
19361148981248207
202330144611056838

[0,20,96,465,2608,15077,89811,544302,3349328,
 20823047,130535918,823585242,5221057054,
 33231082276,212180118775,1358528423728,
 8718262087314,56062919553225,361148981248207,
 2330144611056838]