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A000680 as a simple table

n a(n)
0 1
1 1
2 6
3 90
4 2520
5 113400
6 7484400
7 681080400
8 81729648000
9 12504636144000
10 2375880867360000
11 548828480360160000
12 151476660579404160000
13 49229914688306352000000
14 18608907752179801056000000
15 8094874872198213459360000000
16 4015057936610313875842560000000

[1,1,6,90,2520,113400,7484400,681080400,
 81729648000,12504636144000,2375880867360000,
 548828480360160000,151476660579404160000,
 49229914688306352000000,
 18608907752179801056000000,
 8094874872198213459360000000,
 4015057936610313875842560000000]

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Last modified October 20 04:37 EDT 2018. Contains 316378 sequences. (Running on oeis4.)