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A028667 as a simple table

n a(n)
0 1
1 20
2 12000
3 186000000
4 72540000000000
5 708171750000000000000
6 172882428468750000000000000000
7 1055177097007236328125000000000000000000

[1,20,12000,186000000,72540000000000,
 708171750000000000000,
 172882428468750000000000000000,
 1055177097007236328125000000000000000000]

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Last modified October 4 18:32 EDT 2022. Contains 357239 sequences. (Running on oeis4.)