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A012340 as a simple table

n a(n)
0 1
1 2
2 20
3 488
4 22416
5 1680672
6 187766592
7 29343408768
8 6124074217728
9 1647634955248128
10 555774895924564992
11 229837057464353187840
12 114397631096541960376320
13 67482635629160164765409280

[1,2,20,488,22416,1680672,187766592,29343408768,
 6124074217728,1647634955248128,555774895924564992,
 229837057464353187840,114397631096541960376320,
 67482635629160164765409280]

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Last modified January 31 11:03 EST 2023. Contains 359971 sequences. (Running on oeis4.)