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A020545 as a simple table

n a(n)
0 0
1 0
2 3
3 165
4 12972
5 1706460
6 372470760
7 127985964120
8 65545882234560
9 47784528317211840
10 47784706087589654400
11 63601467702843268598400
12 109903339976314925131660800
13 241457638625928074776576550400

[0,0,3,165,12972,1706460,372470760,127985964120,
 65545882234560,47784528317211840,
 47784706087589654400,63601467702843268598400,
 109903339976314925131660800,
 241457638625928074776576550400]

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Last modified December 8 11:53 EST 2021. Contains 349596 sequences. (Running on oeis4.)