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A199557 as a simple table

na(n)
011
181
2641
35121
440961
5327681
62621441
720971521
8167772161
91342177281
1010737418241
1185899345921
12687194767361
135497558138881
1443980465111041
15351843720888321
162814749767106561
1722517998136852481
18180143985094819841

[11,81,641,5121,40961,327681,2621441,20971521,
 167772161,1342177281,10737418241,85899345921,
 687194767361,5497558138881,43980465111041,
 351843720888321,2814749767106561,
 22517998136852481,180143985094819841]