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A081141 as a simple table

na(n)
00
10
21
333
4726
513310
6219615
73382071
849603708
9701538156
109646149645
11129687123005
121711870023666
1322254310307658
14285596982281611
153624884775112755
1645569980029988920
17568105751040528536

[0,0,1,33,726,13310,219615,3382071,49603708,
 701538156,9646149645,129687123005,1711870023666,
 22254310307658,285596982281611,3624884775112755,
 45569980029988920,568105751040528536]