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A222909 as a simple table

na(n)
115
275
3767
47794
5101398
61346067
721064292
8356150811
96366063573
10115668702638
112139261596454
1239572902785373
13737955955427551
1413730713590038976
15256798310856319397
164793531311138014167

[15,75,767,7794,101398,1346067,21064292,356150811,
 6366063573,115668702638,2139261596454,
 39572902785373,737955955427551,13730713590038976,
 256798310856319397,4793531311138014167]