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A047778 as a simple table

na(n)
11
26
327
4220
51765
614126
7113015
81808248
928931977
10462911642
117406586283
12118505380540
131896086088653
1430337377418462
15485398038695407
1615532737238253040
17497047591624097297
1815905522931971113522
19508976733823075632723
2016287255482338420247156

[1,6,27,220,1765,14126,113015,1808248,28931977,
 462911642,7406586283,118505380540,1896086088653,
 30337377418462,485398038695407,15532737238253040,
 497047591624097297,15905522931971113522,
 508976733823075632723,16287255482338420247156]