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A139173 as a simple table

na(n)
31
47
539
6239
71679
813439
9120959
101209599
1113305599
12159667199
132075673599
1429059430399
15435891455999
166974263295999
17118562476031999
182134124568575999
1940548366802943999
20810967336058879999

[1,7,39,239,1679,13439,120959,1209599,13305599,
 159667199,2075673599,29059430399,435891455999,
 6974263295999,118562476031999,2134124568575999,
 40548366802943999,810967336058879999]