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A257390 as a simple table

na(n)
01
10
21
34
418
580
6357
71596
87150
932096
10144362
11650568
122937316
1313286368
1460205805
15273290988
161242639446
175659468736
1825816338046
19117945079736
20539646216188
212472638868960
2211345220210658
2352124831171544
24239792244636876
251104495824173376

[1,0,1,4,18,80,357,1596,7150,32096,144362,650568,
 2937316,13286368,60205805,273290988,1242639446,
 5659468736,25816338046,117945079736,539646216188,
 2472638868960,11345220210658,52124831171544,
 239792244636876,1104495824173376]