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A222940 as a simple table

na(n)
12
27
333
4273
52433
621873
7196833
81771473
915943233
10143489073
111291401633
1211622614673
13104603532033
14941431788273
158472886094433
1676255974849873
17686303773648833
186176733962839473
1955590605665555233
20500315450989997073

[2,7,33,273,2433,21873,196833,1771473,15943233,
 143489073,1291401633,11622614673,104603532033,
 941431788273,8472886094433,76255974849873,
 686303773648833,6176733962839473,
 55590605665555233,500315450989997073]