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A038781 as a simple table

na(n)
18
2423
3798952
420962209174670288
5247984783510749556137496
6163976067636254581923091475287730651406666
78961962227285899756481561562282509859208082639789128

[8,423,798952,20962209174670288,
 247984783510749556137496,
 163976067636254581923091475287730651406666,
 89619622272858997564815615622825098592080826397891\
 28]