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A134490 as a simple table

na(n)
02
121
2233
32584
428657
5317811
63524578
739088169
8433494437
94807526976
1053316291173
11591286729879
126557470319842
1372723460248141
14806515533049393
158944394323791464
1699194853094755497
171100087778366101931

[2,21,233,2584,28657,317811,3524578,39088169,
 433494437,4807526976,53316291173,591286729879,
 6557470319842,72723460248141,806515533049393,
 8944394323791464,99194853094755497,
 1100087778366101931]