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A183941 as a simple table

na(n)
11
21
313
451
5761
64411
747675
8442337
94838487
1050772785
11584627697
126723246423
1379912390369
14950827647493
1511420632394717
16137246445111917
171661603816786741

[1,1,13,51,761,4411,47675,442337,4838487,50772785,
 584627697,6723246423,79912390369,950827647493,
 11420632394717,137246445111917,1661603816786741]