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A267351 as a simple table

na(n)
01
15
214
3119
456
52015
6224
732639
8896
9523775
103584
118386559
1214336
13134209535
1457344
152147450879
16229376
1734359607295
18917504
19549755289599
203670016
218796090925055
2214680064
23140737479966719
2458720256
252251799780130815
26234881024
2736028796884746239

[1,5,14,119,56,2015,224,32639,896,523775,3584,
 8386559,14336,134209535,57344,2147450879,229376,
 34359607295,917504,549755289599,3670016,
 8796090925055,14680064,140737479966719,58720256,
 2251799780130815,234881024,36028796884746239]