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A227331 as a simple table

na(n)
115
2104
3708
44917
533297
6204206
71108382
85361624
923477312
1094474684
11353596604
121242207201
134125406694
1413026205724
1539292608858
16113681479364
17316556625809
18850933663116
192213918991347
205587988935294
2113711077238915

[15,104,708,4917,33297,204206,1108382,5361624,
 23477312,94474684,353596604,1242207201,4125406694,
 13026205724,39292608858,113681479364,316556625809,
 850933663116,2213918991347,5587988935294,
 13711077238915]