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A337893 as a simple table

na(n)
20
30
40
50
61
70
80
966
1011158298
110
120
13920
144825452718593
15314824333015938998688
160
170
186350
1948038354542204960
2038491882659300767730994725249684096
2131716615393292685397985382790580028572676096
220

[0,0,0,0,1,0,0,66,11158298,0,0,920,4825452718593,
 314824333015938998688,0,0,6350,48038354542204960,
 38491882659300767730994725249684096,
 31716615393292685397985382790580028572676096,0]