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A012418 as a simple table

na(n)
01
10
21
36
421
5100
61005
79170
873353
9794952
1011042745
11144625118
121936131549
1331475441452
14562265168101
159960214270890
16187956163443857
173970728871687824
1888040662078595313
191994667867977462454

[1,0,1,6,21,100,1005,9170,73353,794952,11042745,
 144625118,1936131549,31475441452,562265168101,
 9960214270890,187956163443857,3970728871687824,
 88040662078595313,1994667867977462454]