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A268519 as a simple table

na(n)
1121
2181
31321
411281
515121
6120481
7181921
81327681
911310721
1015242881
11120971521
12183886081
131335544321
1411342177281
1515368709121
16121474836481
17185899345921
181343597383681
1911374389534721
2015497558138881
21121990232555521
22187960930222081
231351843720888321
2411407374883553281

[121,181,1321,11281,15121,120481,181921,1327681,
 11310721,15242881,120971521,183886081,1335544321,
 11342177281,15368709121,121474836481,185899345921,
 1343597383681,11374389534721,15497558138881,
 121990232555521,187960930222081,1351843720888321,
 11407374883553281]