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A268121 as a simple table

na(n)
11
22
35
415
5111
61687
723522
8253472
92290853
1018470974
11140294987
121065068657
138679331941
1480007298457
15822840131716
168854238260868
1794125422868108
18961136731712639
199379785431020093

[1,2,5,15,111,1687,23522,253472,2290853,18470974,
 140294987,1065068657,8679331941,80007298457,
 822840131716,8854238260868,94125422868108,
 961136731712639,9379785431020093]