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A104255 as a simple table

na(n)
10
20
32
413
594
6866
79652
8126689
91914412
1032736453
11624968662
1213176422634
13304071291562
147623501667031
15206342778454312
165996836998828457
17186254702081260312
186156752652130549218
19215810382437839251562
207995774669321944270390
21312215963278285442939062

[0,0,2,13,94,866,9652,126689,1914412,32736453,
 624968662,13176422634,304071291562,7623501667031,
 206342778454312,5996836998828457,
 186254702081260312,6156752652130549218,
 215810382437839251562,7995774669321944270390,
 312215963278285442939062]