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A191478 as a simple table

na(n)
12
27
328
4231
53022
663851
72254102
8129926375
912346854981
101930513304865
11496013097993148
12209682700667891310
13145774046555290357339
14166670977286765976049136
15313418443881609705847873703

[2,7,28,231,3022,63851,2254102,129926375,
 12346854981,1930513304865,496013097993148,
 209682700667891310,145774046555290357339,
 166670977286765976049136,
 313418443881609705847873703]