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A208196 as a simple table

na(n)
15
2178
310366
4639701
539725054
62468504665
7153402542384
89533100532733
9592428713557570
1036816123505610549
112287915709208554132
12142181136908012254369
138835760693778126853518
14549093000211986917072609

[5,178,10366,639701,39725054,2468504665,
 153402542384,9533100532733,592428713557570,
 36816123505610549,2287915709208554132,
 142181136908012254369,8835760693778126853518,
 549093000211986917072609]