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A139157 as a simple table

na(n)
513
673
7505
84033
936289
10362881
113991681
1247900161
13622702081
148717829121
15130767436801
162092278988801
1735568742809601
18640237370572801
1912164510040883201
20243290200817664001
215109094217170944001

[13,73,505,4033,36289,362881,3991681,47900161,
 622702081,8717829121,130767436801,2092278988801,
 35568742809601,640237370572801,12164510040883201,
 243290200817664001,5109094217170944001]