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A337885 as a simple table

na(n)
20
30
40
50
60
70
80
90
106
110
120
131
14405
151368
160
170
185
197904
204775706
216711288
220
230
2415
2576880
261522540416
279923557498416
281785683627824
290
300
3135
32486522
33132342705750
34234239763858347776
3512979826761630383196344
3653302696800142157920
370

[0,0,0,0,0,0,0,0,6,0,0,1,405,1368,0,0,5,7904,
 4775706,6711288,0,0,15,76880,1522540416,
 9923557498416,1785683627824,0,0,35,486522,
 132342705750,234239763858347776,
 12979826761630383196344,53302696800142157920,0]