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A081139 as a simple table

na(n)
00
10
21
327
4486
57290
698415
71240029
814880348
9172186884
101937102445
1121308126895
12230127770466
132447722649502
1425701087819771
15266895911974545
162745215094595320
1728001193964872264
18283512088894331673

[0,0,1,27,486,7290,98415,1240029,14880348,
 172186884,1937102445,21308126895,230127770466,
 2447722649502,25701087819771,266895911974545,
 2745215094595320,28001193964872264,
 283512088894331673]