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A019040 as a simple table

na(n)
01
120
2281
33460
440161
5453300
65048041
755853540
8616079921
96785596180
1074686191801
11821775473220
129040683799681
1399453356876660
141094016369479561
1512034328357198500
16132378357688767441

[1,20,281,3460,40161,453300,5048041,55853540,
 616079921,6785596180,74686191801,821775473220,
 9040683799681,99453356876660,1094016369479561,
 12034328357198500,132378357688767441]