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A020548 as a simple table

n a(n)
0 -1
1 -1
2 9
3 649
4 51841
5 6825601
6 1489881601
7 511943846401
8 262183528857601
9 191138113268121601
10 191138824350351360001
11 254405870811372994560001
12 439613359905259699568640001
13 965830554503712299093852160001

[-1,-1,9,649,51841,6825601,1489881601,
 511943846401,262183528857601,191138113268121601,
 191138824350351360001,254405870811372994560001,
 439613359905259699568640001,
 965830554503712299093852160001]

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Last modified October 22 01:48 EDT 2021. Contains 348160 sequences. (Running on oeis4.)