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A068617 as a simple table

na(n)
18
281
3841
438416
53841600
6384160000
738416000000
83841600000000
9384160000000000
1038416000000000000
113841600000000000000
12384160000000000000000
1338416000000000000000000

[8,81,841,38416,3841600,384160000,38416000000,
 3841600000000,384160000000000,38416000000000000,
 3841600000000000000,384160000000000000000,
 38416000000000000000000]