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A200820 as a simple table

n a(n)
0 1
1 1
2 2
3 16
4 120
5 4296
6 13056
7 8004816
8 -344778624
9 73663017984
10 -9783408639744
11 2198402205799680
12 -511985055715983360
13 152210366371207203840
14 -51349292670021684664320
15 20385380417664342515466240

[1,1,2,16,120,4296,13056,8004816,-344778624,
 73663017984,-9783408639744,2198402205799680,
 -511985055715983360,152210366371207203840,
 -51349292670021684664320,
 20385380417664342515466240]

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Last modified September 25 06:32 EDT 2020. Contains 337335 sequences. (Running on oeis4.)