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A006897 as a simple table

na(n)
01
12
24
38
419
553
6209
71253
813599
9288267
1012293435
111031291299
12166122463891
1350668153831843
1429104823811067331
1531455590793615376099
1664032471295321173271027
17245999896624828253856990803
181787823725042236528801735181651
1924639597076850046760911809226614419

[1,2,4,8,19,53,209,1253,13599,288267,12293435,
 1031291299,166122463891,50668153831843,
 29104823811067331,31455590793615376099,
 64032471295321173271027,
 245999896624828253856990803,
 1787823725042236528801735181651,
 24639597076850046760911809226614419]