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A018209 as a simple table

na(n)
01
116
2173
31580
413161
5103656
6787333
75836420
842545921
9306538496
102190403293
1115560186460
12110074899481
13776359376536
145463959472053
1538396009227700
16269517824177841
171890370747033776
1813251393837657613

[1,16,173,1580,13161,103656,787333,5836420,
 42545921,306538496,2190403293,15560186460,
 110074899481,776359376536,5463959472053,
 38396009227700,269517824177841,1890370747033776,
 13251393837657613]