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A081136 as a simple table

na(n)
00
10
21
318
4216
52160
619440
7163296
81306368
910077696
1075582720
11554273280
123990767616
1328298170368
14198087192576
151371372871680
169403699691520
1763945157902336
18431629815840768
192894458765049856
2019296391766999040

[0,0,1,18,216,2160,19440,163296,1306368,10077696,
 75582720,554273280,3990767616,28298170368,
 198087192576,1371372871680,9403699691520,
 63945157902336,431629815840768,2894458765049856,
 19296391766999040]