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A199115 as a simple table

na(n)
06
121
281
3321
41281
55121
620481
781921
8327681
91310721
105242881
1120971521
1283886081
13335544321
141342177281
155368709121
1621474836481
1785899345921
18343597383681
191374389534721
205497558138881
2121990232555521
2287960930222081

[6,21,81,321,1281,5121,20481,81921,327681,1310721,
 5242881,20971521,83886081,335544321,1342177281,
 5368709121,21474836481,85899345921,343597383681,
 1374389534721,5497558138881,21990232555521,
 87960930222081]