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A038782 as a simple table

na(n)
18
2424
3798960
420962209174670432
5247984783510749556138000
6163976067636254581923091475287730651413600
78961962227285899756481561562282509859208082639814672

[8,424,798960,20962209174670432,
 247984783510749556138000,
 163976067636254581923091475287730651413600,
 89619622272858997564815615622825098592080826398146\
 72]