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A221821 as a simple table

na(n)
13
231
3252
42113
517684
6147920
71237439
810351593
986594795
10724396370
116059833949
1250692672540
13424062286786
143547432284249
1529675536361423
16248246446379403
172076670068892280
1817372085836189001
19145323694322280832

[3,31,252,2113,17684,147920,1237439,10351593,
 86594795,724396370,6059833949,50692672540,
 424062286786,3547432284249,29675536361423,
 248246446379403,2076670068892280,
 17372085836189001,145323694322280832]