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A221904 as a simple table

na(n)
02
119
2181
31729
416561
5159049
61531441
714782969
8143046721
91387420489
1013486784401
11131381059609
121282429536481
1312541865828329
14122876792454961
151205891132094649
1611853020188851841

[2,19,181,1729,16561,159049,1531441,14782969,
 143046721,1387420489,13486784401,131381059609,
 1282429536481,12541865828329,122876792454961,
 1205891132094649,11853020188851841]