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A228972 as a simple table

na(n)
19
281
3729
46387
555887
6488037
74259277
837155951
9324050745
102825717151
1124637772289
12214806377331
131872733313427
1416326535353843
15142332941107035
161240830892976931
1710817256322467417
1894301798866919901
19822094581839055501

[9,81,729,6387,55887,488037,4259277,37155951,
 324050745,2825717151,24637772289,214806377331,
 1872733313427,16326535353843,142332941107035,
 1240830892976931,10817256322467417,
 94301798866919901,822094581839055501]