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A018073 as a simple table

na(n)
01
12
23
36
410
518
632
756
8100
9178
10316
11562
121000
131778
143162
155623
1610000
1717783
1831623
1956234
20100000
21177828
22316228
23562341
241000000
251778279
263162278
275623413
2810000000
2917782794
3031622777
3156234133

[1,2,3,6,10,18,32,56,100,178,316,562,1000,1778,
 3162,5623,10000,17783,31623,56234,100000,177828,
 316228,562341,1000000,1778279,3162278,5623413,
 10000000,17782794,31622777,56234133]