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A347856 as a simple table

na(n)
01
120
2990
356576
43432198
5215147520
613768454700
7893768826880
858626071754822
93876225891958784
10257898242928604740
1117245961314149335040
121158088115444301759900
1378040346182201091555328

[1,20,990,56576,3432198,215147520,13768454700,
 893768826880,58626071754822,3876225891958784,
 257898242928604740,17245961314149335040,
 1158088115444301759900,78040346182201091555328]