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A020547 as a simple table

n a(n)
0 0
1 0
2 2
3 30
4 552
5 14280
6 517680
7 25396560
8 1625662080
9 131681531520
10 13168185811200
11 1593350882323200
12 229442532323558400
13 38775788037405619200
14 7600054456464819148800
15 1710012252722891749632000
16 437763136697374129754112000

[0,0,2,30,552,14280,517680,25396560,1625662080,
 131681531520,13168185811200,1593350882323200,
 229442532323558400,38775788037405619200,
 7600054456464819148800,1710012252722891749632000,
 437763136697374129754112000]

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Last modified December 11 04:17 EST 2016. Contains 279034 sequences.