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A051591 as a simple table

n a(n)
2 1
3 1
4 18
5 66360
6 4147236820
7 19902009929142960
8 10325801406739620796634430
9 776107138571279347069904891019268480
10 10911068841557131648034491574230872615312437194176

[1,1,18,66360,4147236820,19902009929142960,
 10325801406739620796634430,
 776107138571279347069904891019268480,
 10911068841557131648034491574230872615312437194176\
 ]

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Last modified October 3 13:16 EDT 2022. Contains 357237 sequences. (Running on oeis4.)